Siga este enlace para ver otros tipos de publicaciones sobre el tema: Pathogenic potential of V.parahaemolyticu.
Artículos de revistas sobre el tema "Pathogenic potential of V.parahaemolyticu"
Crea una cita precisa en los estilos APA, MLA, Chicago, Harvard y otros
Consulte los 50 mejores artículos de revistas para su investigación sobre el tema "Pathogenic potential of V.parahaemolyticu".
Junto a cada fuente en la lista de referencias hay un botón "Agregar a la bibliografía". Pulsa este botón, y generaremos automáticamente la referencia bibliográfica para la obra elegida en el estilo de cita que necesites: APA, MLA, Harvard, Vancouver, Chicago, etc.
También puede descargar el texto completo de la publicación académica en formato pdf y leer en línea su resumen siempre que esté disponible en los metadatos.
Explore artículos de revistas sobre una amplia variedad de disciplinas y organice su bibliografía correctamente.
1
Gleire Rodrigues de Menezes, Francisca, Soraya Silva Neves, Rafael Dos Santos Rocha, Oscarina Viana Sousa, Marina Teresa Rodriguez Torres, Rodrigo Maggioni, Ernesto Hofer y Regine Helena Silva dos Fernandes Vieira. "PATHOGENIC POTENTIAL OF Vibrio parahaemolyticus ISOLATED FROM TROPICAL ESTUARINE ENVIRONMENTS IN CEARÁ, BRAZIL". Revista de Patologia Tropical / Journal of Tropical Pathology 49, n.º 2 (13 de julio de 2020): 94–104. http://dx.doi.org/10.5216/rpt.v49i2.61338.
Texto completoResumen
Vibrio parahaemolyticus is a potentially pathogenic bacterium that occurs naturally in estuarine environments worldwide. This research aimed to investigate the occurrence of Vibrio parahaemolyticus in estuarine environments and determine the virulence profile in aquaculture environment by molecular techniques and conventional microbiological methods. The analysis included 64 samples of water (n=32) and sediment (n=32) collected in estuaries. The samples yielded 64 strains suspected to be V. parahaemolyticus. The isolates were submitted to biochemical identification using a dichotomous key and PCR for the detection of the species-specific gene tl. Virulence was assessed by testing for urea hydrolysis and ?-hemolysis in erythrocytes (Kanagawa phenomenon) and simultaneous detection of the genes tdh and trh. All but one of the isolates (63/64) were confirmed to be V. parahaemolyticus by genotypic detection of tl. The genes tdh and trh were detected in 57 and 19 isolates, respectively. The Kanagawa test was positive for 51 isolates. Only one isolate was positive for urease. The incidence of tdh/trh-positivity was very high in strains isolated from the environment. The present study demonstrates that the necessity to improve the knowledge of the ecology and pathogeny of V. parahaemolyticus.
2
Almuhaideb, Esam, Lathadevi K. Chintapenta, Amanda Abbott, Salina Parveen y Gulnihal Ozbay. "Assessment of Vibrio parahaemolyticus levels in oysters (Crassostrea virginica) and seawater in Delaware Bay in relation to environmental conditions and the prevalence of molecular markers to identify pathogenic Vibrio parahaemolyticus strains". PLOS ONE 15, n.º 12 (3 de diciembre de 2020): e0242229. http://dx.doi.org/10.1371/journal.pone.0242229.
Texto completoResumen
This study identified Vibrio parahaemolyticus in oyster and seawater samples collected from Delaware Bay from June through October of 2016. Environmental parameters including water temperature, salinity, dissolved oxygen, pH, and chlorophyll a were measured per sampling event. Oysters homogenate and seawater samples were 10-fold serially diluted and directly plated on CHROMagarᵀᴹ Vibrio medium. Presumptive V. parahaemolyticus colonies were counted and at least 20% of these colonies were selected for molecular chracterization. V. parahaemolyticus isolates (n = 165) were screened for the presence of the species-specific thermolabile hemolysin (tlh) gene, the pathogenic thermostable direct hemolysin (tdh)/ thermostable related hemolysin (trh) genes, the regulatory transmembrane DNA-binding gene (toxR), and V. parahaemolyticus metalloprotease (vpm) gene using a conventional PCR. The highest mean levels of the presumptive V. parahaemolyticus were 9.63×103 CFU/g and 1.85×103 CFU/mL in the oyster and seawater samples, respectively, during the month of July. V. parahaemolyticus levels in oyster and seawater samples were significantly positively correlated with water temperature. Of the 165 isolates, 137 (83%), 110 (66.7%), and 108 (65%) were tlh+, vpm+, and toxR+, respectively. Among the V. parahaemolyticus (tlh+) isolates, 7 (5.1%) and 15 (10.9%) were tdh+ and trh+, respectively, and 24 (17.5%), only oyster isolates, were positive for both genes. Potential pathogenic strains that possessed tdh and/or trh were notably higher in oyster (39%) than seawater (15.6%) isolates. The occurrence of total V. parahaemolyticus (tlh+) was not necessarily proportional to the potential pathogenic V. parahaemolyticus. Co-occurrence of the five genetic markers were observed only among oyster isolates. The co-occurrence of the gene markers showed a relatedness potential of tdh occurrence with vpm. We believe exploring the role of V. parahaemolyticus metalloprotease and whether it is involved in the toxic activity of the thermostable direct hemolysin (TDH) protein can be of significance. The outcomes of this study will provide some foundation for future studies regarding pathogenic Vibrio dynamics in relation to environmental quality.
3
Novotny, L., L. Dvorska, A. Lorencova, V. Beran y I. Pavlik. "Fish: a potential source of bacterial pathogens for human beings ". Veterinární Medicína 49, No. 9 (29 de marzo de 2012): 343–58. http://dx.doi.org/10.17221/5715-vetmed.
Texto completoResumen
Human infections caused by pathogens transmitted from fish or the aquatic environment are quite common and depend on the season, patients’ contact with fish and related environment, dietary habits and the immune system status of the exposed individual. They are often bacterial species facultatively pathogenic for both fish and human beings and may be isolated from fish without apparent symptoms of the disease. The infection source may be fish kept for both for food and as a hobby. Human infections and intoxications with the following bacteria have been recorded: Mycobacterium spp., Streptococcus iniae, Photobacterium damselae, Vibrio alginolyticus, V. vulnificus, V. parahaemolyticus, V. cholerae, Erysipelothrix rhusiopathiae, Escherichia coli, Aeromonas spp., Salmonella spp., Staphylococcus aureus, Listeria monocytogenes, Clostridium botulinum, C. perfringens, Campylobacter jejuni, Delftia acidovorans, Edwardsiella tarda, Legionella pneumophila, and Plesiomonas shigelloides. Fish tissue histamine intoxications of people have frequently been described. The purpose of the present paper was to elaborate an overview of significant bacterial causative agents of human diseases transmitted from fish used as food or by handling them.
4
Kohli, Vandita, Ramasubramanian Vaidhyanathan, Amjad K. Balange, Binaya Bhusan Nayak y Sanath H. Kumar. "Distribution of Vibrio parahaemolyticus in Farmed Shrimp Penaeus vannamei, Farm Water and Sediment". Journal of Pure and Applied Microbiology 15, n.º 3 (23 de agosto de 2021): 1608–16. http://dx.doi.org/10.22207/jpam.15.3.57.
Texto completoResumen
The halophilic marine bacterium Vibrio parahaemolyticus is a zoonotic pathogen associated with wild-caught and farmed shrimp. The bacterium is an important cause of gastroenteritis associated with the consumption of raw or undercooked seafood. In the present study, the prevalence and human pathogenic potential of Vibrio parahaemolyticus in Penaeus vannamei (tissue and hepatopancreas) and the farm environment (water and sediment) was investigated by conventional culture and molecular techniques. The total Vibrio counts of P. vannamei ranged from <1 CFU/mL in hemolymph to 7.61 log CFU/g in the hepatopancreas. The sediment samples consistently showed the counts of 6-7 log CFU/g, while the pond water had Vibrio counts in the range of 2-3 log CFU/ml. Of 120 Vibrio isolates identified, 87 were confirmed as V. parahaemolyticus based on the toxR and tlh gene-specific PCR. The virulence marker gene tdh was not detected in any of the isolates, while the trh gene was detected in 3 (3.6%) isolates. Although the incidence of pathogenic V. parahaemolyticus in farmed P. vannamei is low, the high numbers of total vibrios and V. parahaemolyticus demand constant monitoring of animals and the farm environment for human pathogenic strains of V. parahaemolyticus.
5
KAYSNER, CHARLES A., CARLOS ABEYTA, ROBERT F. STOTT, MARY HELEN KRANE y MARLEEN M. WEKELL. "Enumeration of Vibrio Species, Including V. cholerae, from Samples of an Oyster Growing Area, Grays Harbor, Washington". Journal of Food Protection 53, n.º 4 (1 de abril de 1990): 300–301. http://dx.doi.org/10.4315/0362-028x-53.4.300.
Texto completoResumen
Water, shellfish, and sediment samples from Grays Harbor, a major commercial oyster producing estuary in the State of Washington, were examined for levels of Vibrio species. Non-01 V. cholerae was found at low levels in 37.8% of the samples. While V. parahaemolyticus was found in all samples, levels were low. V. mimicus and V. fluvialis were found infrequently and at low levels. Potentially pathogenic strains of non-01 V. cholerae and Kanagawa positive V. parahaemolyticus were isolated from oysters suggesting a potential for human illness.
6
Palamae, Suriya, Ajay Mittal, Mingkwan Yingkajorn, Jirakrit Saetang, Jirayu Buatong, Anuj Tyagi, Prabjeet Singh y Soottawat Benjakul. "Vibrio parahaemolyticus Isolates from Asian Green Mussel: Molecular Characteristics, Virulence and Their Inhibition by Chitooligosaccharide-Tea Polyphenol Conjugates". Foods 11, n.º 24 (14 de diciembre de 2022): 4048. http://dx.doi.org/10.3390/foods11244048.
Texto completoResumen
Fifty isolates of Vibrio parahaemolyticus were tested for pathogenicity, biofilm formation, motility, and antibiotic resistance. Antimicrobial activity of chitooligosaccharide (COS)-tea polyphenol conjugates against all isolates was also studied. Forty-three isolates were randomly selected from 520 isolates from Asian green mussel (Perna viridis) grown on CHROMagarTM Vibrio agar plate. Six isolates were acquired from stool specimens of diarrhea patients. One laboratory strain was V. parahaemolyticus PSU.SCB.16S.14. Among all isolates tested, 12% of V. parahaemolyticus carried the tdh+trh– gene and were positive toward Kanagawa phenomenon test. All of V. parahaemolyticus isolates could produce biofilm and showed relatively strong motile ability. When COS-catechin conjugate (COS-CAT) and COS-epigallocatechin-3-gallate conjugate (COS-EGCG) were examined for their inhibitory effect against V. parahaemolyticus, the former showed the higher bactericidal activity with the MBC value of 1.024 mg/mL against both pathogenic and non-pathogenic strains. Most of the representative Asian green mussel V. parahaemolyticus isolates exhibited high sensitivity to all antibiotics, whereas one isolate showed the intermediate resistance to cefuroxime. However, the representative clinical isolates were highly resistant to nine types of antibiotics and had multiple antibiotic resistance (MAR) index of 0.64. Thus, COS-CAT could be used as potential antimicrobial agent for controlling V. parahaemolyticus-causing disease in Asian green mussel.
7
Thongchankaew, Uraiwan, Pimonsri Mittraparp-arthorn, Pharanai Sukhumungoon, Natta Tansila, Taiyeebah Nuidate, Mitsuaki Nishibuchi y Varaporn Vuddhakul. "Occurrence of potentially pathogenic vibrios and related environmental factors in Songkhla Lake, Thailand". Canadian Journal of Microbiology 57, n.º 11 (noviembre de 2011): 867–73. http://dx.doi.org/10.1139/w11-084.
Texto completoResumen
Vibrios are halophilic bacteria that are ubiquitous in marine environments. Their occurrence in tropical lakes has rarely been investigated. In this study, the predominance and diversity of Vibrio spp. was investigated over a 12-month period in a coastal lagoon, Songkhla Lake, in southern Thailand. Water samples were collected at 2 stations in the estuary near Yor Island in Songkhla Lake. The predominant vibrios were detected by a culture-based method, using thiosulfate–citrate–bile salt–sucrose agar and CHROMagar Vibrio. The diversity of Vibrio spp. was evaluated using denaturant density gradient electrophoresis (DGGE). The highest numbers of total vibrios and Vibrio parahaemolyticus in both areas were observed during the summer. There was no significant correlation between the numbers of vibrios, including V. parahaemolyticus, and either the water temperature or plankton density. Variations in Vibrio species were observed with changes in salinity. Vibrio parahaemolyticus and V. cholerae non-O1/non-O139 were detected during the rainy season when the salinity dropped to nearly 0 parts per thousand. In both areas, V. alginolyticus was the most prominent species detected by the culture method, whereas Vibrio parahaemolyticus was detected by DGGE, every month. Other Vibrio spp. of potential public health concern were also detected by the culture method; they included V. vulnificus , V. fluvialis , and V. mimicus .
8
MATTÉ, GLAVUR R., MARIA H. MATTÉ, IRMA G. RIVERA y MARIA T. MARTINS. "Distribution of Potentially Pathogenic Vibrios in Oysters from a Tropical Region". Journal of Food Protection 57, n.º 10 (1 de octubre de 1994): 870–73. http://dx.doi.org/10.4315/0362-028x-57.10.870.
Texto completoResumen
Oysters (Crassostrea gigas) originating from the southern coast of the State of São Paulo-Brazil were analyzed for Vibrio species. Most Probable Numbers (MPN/100 g) were obtained for Vibrio alginolyticus (<3-1,500), Vibrio parahaemolyticus (<3-1,200), Vibrio fluvialis (<3-150), Vibrio cholerae non 01 (<3-40), Vibrio furnissii (<3-40), Vibrio mimicus (<3-40) and Vibrio vulnificus (<3-30). The highest incidence was observed for V. alginolyticus (81%), followed by V. parahaemolyticus (77%), V. cholerae non 01 (31 %), V. fluvialis (27%), V. furnissii (19%), V. mimicus (12%), and V. vulnificus (12%). Forty-eight percent of the isolates tested were positive for enterotoxins in the rabbit ileal loop (RIL) test and 11.1% in the suckling mice test. Vibrio parahaemolyticus (1.1 %) was positive in the Kanagawa test. Vibrio vulnificus (25%) showed lethality in young adult mice. During the field inspection it was observed that generally the conditions of storage were not adequate as 65% of the samples were maintained in temperatures ranging from 25 to 40°C, 19% were frozen, 12% refrigerated and 4% was immersed in contaminated seawater. These results emphasize the great potential for food poisoning by inadequately preserved seafood, and the necessity to upgrade the standards for food quality assessment.
9
WAGLEY, SARIQA, KEGAKILWE KOOFHETHILE y RACHEL RANGDALE. "Prevalence and Potential Pathogenicity of Vibrio parahaemolyticus in Chinese Mitten Crabs (Eriocheir sinensis) Harvested from the River Thames Estuary, England". Journal of Food Protection 72, n.º 1 (1 de enero de 2009): 60–66. http://dx.doi.org/10.4315/0362-028x-72.1.60.
Texto completoResumen
Chinese mitten crabs (Eriocheir sinensis) have been described as an alien invasive species in the River Thames, United Kingdom, and elsewhere in Europe. The crabs can cause considerable physical damage to the riverbeds and threaten native ecosystems. Trapping has been considered an option, but such attempts to control mitten crab populations in Germany in the 1930s failed. In the United Kingdom, it has been suggested that commercial exploitation of the species could be employed as a control option. This study was conducted as part of a larger program to assess the suitability of a commercial Chinese mitten crab fishery in the River Thames. Crabs and water samples from the River Thames between 2003 and 2006 were examined for the human pathogenic bacterium Vibrio parahaemolyticus. All samples throughout this testing period were positive for V. parahaemolyticus. The putative pathogenicity markers, thermostable direct hemolysin and thermostable direct–related hemolysin, were detected in one sample, indicating that the crabs possessed the potential to cause V. parahaemolyticus–associated illness if consumed without further processing. Levels of V. parahaemolyticus were higher during the summer than in the winter. This is the first study of V. parahaemolyticus prevalence in European-adapted Chinese mitten crabs.
10
Ilmiah, Sukenda, Widanarni y Enang Harris. "Isolation and characterization of pathogenic Vibrio on tiger grouper Epinephelus fuscoguttatus". Jurnal Akuakultur Indonesia 11, n.º 1 (14 de noviembre de 2013): 28. http://dx.doi.org/10.19027/jai.11.28-37.
Texto completoResumen
<p>This study was aimed to obtain pathogenic bacterial isolate causing vibriosis disease. Isolation of <em>Vibrio</em> was conducted from maribound tiger grouper collected from floating net cage in Barru Regency using TCBS medium. Ability to cause vibriosis was confirmed by pathogenicity test performed by mean injecting the tiger grouper juveniles with bacterial suspension at concentration of 10<sup>6</sup> CFU/fish and mortality of fish during seven days observation then was noted. Then, the <em>Vibrio</em> pathogenic isolate was characterized and identified based on morphology, growth, and biochemical features. Moreover, the most pathogenic isolate was identified by molecular analysis of 16S-rRNA gene sequences. The results showed that three potential isolates caused Vibriosis disease in tiger grouper culture. The isolates tested were biochemically identified as <em>V</em><em>ibrio</em><em> metschnikovii</em>,<em> V</em><em>.</em><em> parahaemolyticus</em>, and <em>V. mimicus</em>. The most virulent among isolates was <em>V. parahaemolyticus.</em></p> <p>Keywords: isolation, characterization, pathogenic, vibriosis, tiger grouper</p>
11
Wang, Qingyao, Songzhe Fu, Qian Yang, Jingwei Hao, Can Zhou y Ying Liu. "The Impact of Water Intrusion on Pathogenic Vibrio Species to Inland Brackish Waters of China". International Journal of Environmental Research and Public Health 17, n.º 18 (17 de septiembre de 2020): 6781. http://dx.doi.org/10.3390/ijerph17186781.
Texto completoResumen
The estuary is the ecological niche of pathogenic Vibrio spp. as it provides abundant organic and inorganic nutrients from seawater and rivers. However, little is known about the ecology of these Vibrio species in the inland brackish water area. In this study, their co-occurrence and relationships to key environmental constraints (salinity and temperature) in the Hun-Tai River of China were examined using the most probable number polymerase chain reaction (MPN-PCR) approach. We hereby report 2-year continuous surveillance based on six water indices of the Hun-Tai River. The results showed that seawater intrusion maximally reached inland as far as 26.5 km for the Hun-Tai River. Pathogenic Vibrio spp. were detected in 21.9% of the water samples. In particular, V. cholerae, V. parahaemolyticus, and V. vulnificus were isolated in 10 (10.4%), 20 (20.8.5%), and 2 (2.08%) samples, respectively. All V. parahaemolyticus strains were tdh gene negative, 10% were positive for the trh gene. Multi-locus sequence typing (MLST) divided V. parahaemolyticus strains into 12 sequence types (STs) for the Hun-Tai River. Five STs were respectively present in various locations along the Hun-Tai River. The PCR assay for detecting six virulence genes and Vibrio seventh pandemic island I and II revealed three genotypes in 12 V. cholerae isolates. The results of our study showed that seawater intrusion and salinity have profound effects on the distribution of pathogenic Vibrio spp. in the inland river, suggesting a potential health risk associated with the waters of the Hun-Tai River used for irrigation and drinking.
12
VILLICAÑA, CLAUDIA, LUIS AMARILLAS, LILIANA SOTO-CASTRO, BRUNO GÓMEZ-GIL, MARCIAL LEONARDO LIZÁRRAGA-PARTIDA y JOSEFINA LEÓN-FÉLIX. "Occurrence and Abundance of Pathogenic Vibrio Species in Raw Oysters at Retail Seafood Markets in Northwestern Mexico". Journal of Food Protection 82, n.º 12 (14 de noviembre de 2019): 2094–99. http://dx.doi.org/10.4315/0362-028x.jfp-19-237.
Texto completoResumen
ABSTRACT Seafood has frequently been associated with foodborne illness because pathogens are easily introduced during seafood cultivation, handling, and processing. Vibrio parahaemolyticus and Vibrio cholerae are human pathogens that cause gastroenteritis and cholera, respectively, and Vibrio vulnificus can cause fatal wound infections and septicemia. However, information about the occurrence of these pathogens in oysters from the Pacific coast of Mexico is limited to V. parahaemolyticus. In the present study, we evaluated the presence and abundance of these three Vibrio species in 68 raw oysters (Crassostrea corteziensis) obtained from retail seafood markets in Sinaloa, Mexico. The most probable number (MPN)–PCR assay was used for amplification of the tlh (thermolabile hemolysin), ompW (outer membrane protein), and vvhA (hemolytic cytolysin) genes that are specific to V. parahaemolyticus, V. cholerae, and V. vulnificus, respectively. All oyster samples were positive for at least one Vibrio species. V. parahaemolyticus, V. cholerae, and V. vulnificus prevalences were 77.9, 8.8, and 32.3% overall, respectively, and most species were present in all sample periods with increased prevalence in period 3. The tdh (thermostable direct hemolysin) gene was detected in 30.1%, trh (TDH-related hemolysin) was detected in 3.7%, and tdh/trh was detected in 7.5% of the total tlh-positive samples (53 of 68), whereas the pandemic serotype O3:K6 (orf8 positive) was detected in only 1 sample (1.8%). The total prevalence of tdh and/or trh was 41.5%. In none of the samples positive for V. cholerae were the cholera toxin (ctxA) and cholix (chxA) toxigenic genes or the rfb gene encoding the O1 and O139 antigens amplified, suggesting the presence of non-O1 non-O139 V. cholerae strains. Our results clearly indicated a high prevalence of pathogenic Vibrio species in raw oysters from retail seafood markets in Mexico. Consumption of these raw oysters carries the potential risk of foodborne illness, which can be limited by cooking. HIGHLIGHTS
13
HE, YU, SHUAI WANG, XIANTING YIN, FENGJIAO SUN, BIN HE y XIAO LIU. "Comparison of Extracellular Proteins from Virulent and Avirulent Vibrio parahaemolyticus Strains to Identify Potential Virulence Factors". Journal of Food Protection 83, n.º 1 (20 de diciembre de 2019): 155–62. http://dx.doi.org/10.4315/0362-028x.jfp-19-188.
Texto completoResumen
ABSTRACT Vibrio parahaemolyticus is a leading seafood-borne pathogen that causes gastroenteritis, septicemia, and serious wound infections due to the actions of virulence-associated proteins. We compared the extracellular proteins of nonvirulent JHY20 and virulent ATCC 33847 V. parahaemolyticus reference strains. Eighteen extracellular proteins were identified from secretory profiles, and 11 (68.75%) of the 16 proteins in ATCC 33847 are associated with virulence and/or protection against adverse conditions: trigger factor, chaperone SurA, aspartate–semialdehyde dehydrogenase, 4-hydroxy-3-methylbut-2-en-1-yl diphosphate synthase, glutamate 5-kinase, alanine dehydrogenase, glyceraldehyde-3-phosphate dehydrogenase, outer membrane protein OmpV, ribosome-associated inhibitor A, chaperone protein Skp, and universal stress protein. Two nontoxic-related proteins, amino acid ABC transporter substrate-binding protein and an uncharacterized protein, were identified in JHY20. The results provide a theoretical basis for supporting safety risk assessment of aquatic foods, illuminate the pathogenic mechanisms of V. parahaemolyticus, and assist the identification of novel vaccine candidates for foodborne pathogens. HIGHLIGHTS
14
Staley, Christopher y Valerie J. Harwood. "The Use of Genetic Typing Methods to Discriminate Among Strains of Vibrio cholerae, V. parahaemolyticus, and V. vulnificus". Journal of AOAC INTERNATIONAL 93, n.º 5 (1 de septiembre de 2010): 1553–69. http://dx.doi.org/10.1093/jaoac/93.5.1553.
Texto completoResumen
Abstract This review article summarizes the findings of recent typing studies conducted on Vibrio cholerae, V. parahaemolyticus, and V. vulnificus. The DNA-based methods used to type the Vibrio spp. include whole genome approaches, such as pulsed field gel electrophoresis (PFGE), ribotyping, and repetitive extragenic palindromic (REP)-PCR, single gene targets, and multiple gene targets (multilocus approaches). The goals of these studies include establishing the relatedness of isolates from disease epidemics, discriminating among strains with more or less potential to cause disease or epidemics, and exploring the population biology of these waterborne pathogens. PFGE was consistently among the more discriminatory of the typing methods for all three Vibrio spp., and was useful for tracing the temporal and geographic relatedness of epidemic strains of V. cholerae and V. parahaemolyticus. However, PFGE did not group V. vulnificus strains according to the genotypes that have been proposed as markers of virulence potential. Typing methods that target repetitive elements distributed throughout the genome, such as BOX-PCR and REP-PCR, and DNA sequence-based methods, such as multilocus sequence typing, were also highly discriminatory and, in some cases, superior to PFGE for phylogenetic analysis and identification of strains with high epidemic or virulence potential. As typing methods and strategies are refined and used, the epidemiology, virulence potential, and ecology of these pathogenic Vibrio spp. will become better understood.
15
Vu, Ngo Nguyen, Pham Van Kim Ngoc y Pham Thi Hoa. "Antibacterial activity of three wild wood-decaying fungi in southern Vietnam toward Vibrio parahaemolyticus bacterium in aquaculture wastewater". Vietnam Journal of Biotechnology 14, n.º 4 (19 de abril de 2018): 705–12. http://dx.doi.org/10.15625/1811-4989/14/4/12304.
Texto completoResumen
This research demonstrated antibacterial activity of wood-decaying fungi to treat the aquaculture pathogenic bacterium, Vibrio parahaemolyticus (V. parahaemolyticus). Three wild wood-decaying fungi (WDF) collected in Southern Vietnam including Flavodon flavus (F. flavus), Physisporinus vitreis (P. vitreis), and Schizophyllum commune (S. commune) were tested to treat V. parahaemolyticus presented in aquaculture wastewater. Fungal adaptation to different salt concentrations at 0, 10, 15, 20, and 30‰ was tested for the assessment of application potential of these fungi in the aquaculture farming. Fungal mycelium could adapt differently to saline conditions. All three strains grew well at low salt concentration (0-10‰), but only F. flavus survived up to 20‰ NaCl. For the antibacterial ability toward V. parahaemolyticus, two experiments using mycelium culture broth and mycofiltration were performed. Results revealed that all the three species of WDF effectively inhibited V. parahaemolyticus. Thus, mycelium culture broth of P. vitreis, S. commune, and F. flavus could inhibit 98.7, 96.5 and 97.8% V. parahaemolyticus, respectively after 8 hours. Even higher inhibitory effects were observed in the mycofiltration experiment, the efficiency reached 100% for P. vitreis, and 98% for F. flavus and S. commune after 8 hours. The obtained results showed very good application potential of myco-remediation technique using WDF in the treatment of V. parahaemolyticus in aquaculture farming. Mycofilter can be used as a new approach for controlling aquaculture disease, specifically Vibrio sp. treatment based on the antibiotic capability of these WDF. The reduction in pH of the mycelium broth can illustrated for the acidification during the mycelium development and could link with the bactericide capacity of these WDF.
16
GDOURA, MORSI, HANEN SELLAMI, HANEN NASFI, RAHMA TRABELSI, SABEUR MANSOUR, TOURAYA ATTIA, SIWAR NSAIBIA, TATIANA VALLAEYS, RADHOUANE GDOURA y MARIAM SIALA. "Molecular Detection of the Three Major Pathogenic Vibrio Species from Seafood Products and Sediments in Tunisia Using Real-Time PCR". Journal of Food Protection 79, n.º 12 (1 de diciembre de 2016): 2086–94. http://dx.doi.org/10.4315/0362-028x.jfp-16-205.
Texto completoResumen
ABSTRACT Vibrio spp. have emerged as a serious threat to human health worldwide. V. parahaemolyticus, V. cholerae, and V. vulnificus pose a considerable public health risk in Tunisia because they cause sporadic and epidemic foodborne infections associated with the consumption of raw or undercooked contaminated seafood. More recently, toxR-positive V. alginolyticus was also reported to be a potential source of contaminated seafood. A total of 247 samples, including 113 fishes (Labrus viridis, Penaeus kerathurus, Diplodus annularis, Diplodus sparaillon, Scorparna porcus, Sarpa salpa, Dentex dentex, Scorparna scrofa, Sardinella aurita, Trachurus trachurus, Synodus saurus, Pagellus erythrinus, and Metapenaeus monoceros), 83 clams (Ruditapes decussatus species), 30 seawater samples, and 21 sediment samples were analyzed using traditional culture methods (ISO/TS 21872-1; International Organization for Standardization 2007) and a conventional PCR method for Vibrio spp. identification. A rapid, sensitive, and highly reproducible real-time PCR assay was developed to detect the three major Vibrio spp. pathogenic for humans in Tunisian seafood products and sediments. A conventional culture method found 102 (41.3%) of 247 analyzed samples positive for Vibrio spp.; a conventional PCR method found 126 (51%) of the 247 samples positive. Real-time PCR assay found 126 (51.1%) samples positive; V. alginolyticus toxR was the most common, found in 99 (78.57%) of samples, followed by V. parahaemolyticus in 26 (20.63%) and V. cholerae in 1 (0.7%). All culture-positive samples were PCR positive. However, 24 samples that were positive by conventional PCR and real-time PCR were culture negative. Our findings indicate that retail seafood is commonly contaminated with Vibrio spp. and presents a potential risk to human health in Tunisia. These data also indicate that real-time PCR can provide sensitive species-specific detection of Vibrio spp. in seafood without prior isolation and characterization of the bacteria by traditional microbiological methods.
17
Yeung, P. S. Marie, Micaela C. Hayes, Angelo DePaola, Charles A. Kaysner, Laura Kornstein y Kathryn J. Boor. "Comparative Phenotypic, Molecular, and Virulence Characterization of Vibrio parahaemolyticus O3:K6 Isolates". Applied and Environmental Microbiology 68, n.º 6 (junio de 2002): 2901–9. http://dx.doi.org/10.1128/aem.68.6.2901-2909.2002.
Texto completoResumen
ABSTRACT Historically, Vibrio parahaemolyticus infections have been characterized by sporadic cases caused by multiple, diverse serotypes. However, since 1996, V. parahaemolyticus serotype O3:K6 strains have been associated with several large-scale outbreaks of illness, suggesting the emergence of a “new” group of organisms with enhanced virulence. We have applied three different molecular subtyping techniques to identify an appropriate method for differentiating O3:K6 isolates from other serotypes. Pulsed-field gel electrophoresis (PFGE) following NotI digestion differentiated seven closely related subtypes among O3:K6 and related strains, which were distinct from PFGE patterns for non-O3:K6 isolates. Ribotyping and tdh sequencing were less discriminatory than PFGE, but further confirmed close genetic relationships among recent O3:K6 isolates. In vitro adherence and cytotoxicity studies with human epithelial cells showed that O3:K6 isolates exhibited statistically higher levels of adherence and cytotoxicity to host cells than non-O3:K6 isolates. Epithelial cell cytotoxicity patterns were determined with a lactate dehydrogenase release assay. At 3 h postinfection, high relative cytotoxicities (>50% maximum lactate dehydrogenase activity) were found among a greater proportion of recently isolated O3:K6 and closely related strains (75%) than among the non-O3:K6 isolates (23%). A statistically significant relationship between adherence and cytotoxicity suggests that the pathogenic potential of some isolates may be associated with increased adherence to epithelial cells. Our findings suggest that enhanced adherence and cytotoxicity may contribute to the apparent unique pathogenic potential of V. parahaemolyticus O3:K6 strains.
18
Akter, Soudiya, Farah Zereen, Md Saiful Islam, Md Abdus Sobur, Md Ismail Hossen, Mahbubul Pratik Siddique, Muhammad Tofazzal Hossain y Md Tanvir Rahman. "Molecular detection of Vibrio cholerae and Vibrio parahaemolyticus from healthy broilers and backyard chickens for the first time in Bangladesh- A preliminary study". Veterinary Integrative Sciences 20, n.º 2 (9 de febrero de 2022): 431–42. http://dx.doi.org/10.12982/vis.2022.032.
Texto completoResumen
Many of the Vibrio spp. are major public health concerns globally. Vibrio cholerae and Vibrio parahaemolyticus are the etiology of pandemic and epidemic diarrhea and foodborne illness, respectively. Poultry has the potential to harbor pathogenic Vibrio spp., which can have a detrimental impact on public health if they are transmitted to humans. We, therefore, screened 54 cloacal swab samples from healthy chickens (broiler=27, backyard= 27) to detect V. cholerae and V. parahaemolyticus. Vibrio spp. were isolated and identified by culturing, biochemical tests, PCR, and antibiogram profiles were determined by disk diffusion method. By PCR, 29.63% (16/54; 95% CI: 19.14-42.83%) samples were positive for Vibrio spp., where backyard chickens had a significantly higher (p< 0.05) occurrence (44.44%; 27.59-62.69%) than broilers (14.82%; 95% CI: 5.92-32.48%). V. parahaemolyticus was found in 22.22% (6/27; 95% CI: 10.61-40.76%) of backyard chicken samples, which was significantly dominant (p< 0.05) than in broilers (0/27, 0%, 95% CI: 0.00-12.46%). In addition, V. cholerae was positive in 7.41% (2/27; 95% CI: 1.32-23.37%) of broiler, and 14.82% (4/27; 95% CI: 5.92-32.48%) of backyard chicken samples. The toxR gene was found in all V. cholerae isolates, suggesting the presence of other virulence genes, whereas no isolates of V. parahaemolyticus contained the tdh gene. Isolated Vibrio spp. had high to moderate resistance to tetracycline, azithromycin, erythromycin, and streptomycin. The occurrence of antibiotic-resistant V. cholerae and V. parahaemolyticus in broiler and backyard chickens is of public health concern because of the possibility of food chain contamination
19
Gámez-Bayardo, Sergio, Gloria Marisol Castañeda-Ruelas, Angélica Espinosa-Plascencia, María del Carmen Bermúdez-Almada y Maribel Jiménez-Edeza. "Characterization of Vibrio parahaemolyticus strains and evaluation of shrimp cultivation conditions in a farm at the northwestern of Mexico, as risk predictors for its adaptation and dissemination". Latin American Journal of Aquatic Research 49, n.º 1 (1 de marzo de 2021): 75–85. http://dx.doi.org/10.3856/vol49-issue1-fulltext-2512.
Texto completoResumen
Vibrio parahaemolyticus is recognized as a human pathogen as well as the causative agent of vibriosis in shrimp. This study determined the pathogenic, antimicrobial, and biotic potential of V. parahaemolyticus isolated from white shrimp (Penaeus vannamei) and seawater on a northwestern Mexico farm. A total of 140 samples were randomly collected, including juvenile organisms (n = 120) and seawater (n = 20). The pH, salinity, and biota of the ponds were used to correlate with bacterium presence. The strains were characterized by virulence genes presence, biofilm formation capacity, antimicrobial sensitivity, and the kinetics growth using PCR, microplates method, minimum inhibitory concentration (MIC), and spectrophotometry, respectively. V. parahaemolyticus was detected in 7.1% of the samples with a mean concentration of 3.72 ± 1.24 log CFU mL-1; 6.7% (8/120) in shrimp and 10.0% (2/20) in seawater. Cultivation conditions were not predictive of the specie (P > 0.05). V. parahaemolyticus showed an adaptation time of 1.0 h, and a growth rate of 0.375 h-1 in seawater at 30ºC. The strains were classified into two pathotypes: tlh+/tdh-/trh-/AP2- (75%) and tlh+/tdh-/trh-/AP2+ (25%) and three resistant profiles to clinical drugs (ampicillin, amikacin, gentamicin, and netilmicin). The MIC values against oxytetracycline (OTC), florfenicol (FFC) and enrofloxacin (ENRO) were >0.50, >0.25 and >0.06 μg mL-1, respectively. Biofilm formation was a property identified in 40% of the strains. The presence of infectious V. parahaemolyticus with high adaptative potential justifies integrating integrated aquaculture practices and management to control pathogen growth and shrimp health.
20
Huynh, Trinh N. T. "Prevalence, antimicrobial resistance profiles and virulence genes of Vibrio spp. isolated from shrimp retails in Ho Chi Minh City (Vietnam)". Journal of Agriculture and Development 18, n.º 03 (28 de junio de 2019): 27–34. http://dx.doi.org/10.52997/jad.5.03.2019.
Texto completoResumen
This study was conducted to determine the diversity of pathogenic Vibrio species, the antimicrobial resistance profile and the presence of virulence genes linked to food-borne pathogens of Vibrio spp. isolated from shrimp samples in Ho Chi Minh City, Vietnam. A total of 40 raw shrimp batches were collected from retails markets (supermarket and street). All 133 test strains were isolated from 40 shrimp samples. V. parahaemolyticus was the most common species (87.5%), followed by V. navarrensis (60%), V. alginolyticus (52.5%), V. cholerae non-O1 (37.5%), V. vulnificus (22.5%), and V. fluvialis (10%). Vibrio spp. isolates were susceptible to 12 antimicrobial agents. The prevalence of ampicillin resistance was highest (82.7%), followed by cotrimoxazole (18.8%) and 3rd generation cephalosporins (16.5% cefotaxime and 8.3% ceftazidime). Extended spectrum β lactamase (ESBL) activity was detected in 28.1% V. parahaemolyticus isolates. None of tdh or trh virulence genes were detected. The results of this study indicated the presentation of Vibrio species in shrimp samples purchased in Ho Chi Minh City. Therefore, our results could be of great potential for the identification of Vibrio infection in shrimp samples taken from different regions to improve food quality and safety.
21
Faleye, Olajide Sunday, Ezhaveni Sathiyamoorthi, Jin-Hyung Lee y Jintae Lee. "Inhibitory Effects of Cinnamaldehyde Derivatives on Biofilm Formation and Virulence Factors in Vibrio Species". Pharmaceutics 13, n.º 12 (17 de diciembre de 2021): 2176. http://dx.doi.org/10.3390/pharmaceutics13122176.
Texto completoResumen
Vibrio parahaemolyticus is considered one of the most relevant pathogenic marine bacteria with a range of virulence factors to establish food-related gastrointestinal infections in humans. Cinnamaldehyde (CNMA) and some of its derivatives have antimicrobial and antivirulence activities against several bacterial pathogens. This study examined the inhibitory effects of CNMA and its derivatives on biofilm formation and the virulence factors in Vibrio species, particularly V. parahaemolyticus. CNMA and ten of its derivatives were initially screened against V. parahaemolyticus biofilm formation, and their effects on the production of virulence factors and gene expression were studied. Among the CNMA derivatives tested, 4-nitrocinnamaldehyde, 4-chlorocinnamaldehyde, and 4-bromocinnamaldehyde displayed antibacterial and antivirulence activities, while the backbone CNMA had weak effects. The derivatives could prevent the adhesion of V. parahaemolyticus to surfaces by the dose-dependent inhibition of cell surface hydrophobicity, fimbriae production, and flagella-mediated swimming and swarming phenotypes. They also decreased the protease secretion required for virulence and indole production, which could act as an important signal molecule. The expression of QS and biofilm-related genes (aphA, cpsA, luxS, and opaR), virulence genes (fliA, tdh, and vopS), and membrane integrity genes (fadL, and nusA) were downregulated in V. parahaemolyticus by these three CNMA analogs. Interestingly, they eliminated V. parahaemolyticus and reduced the background flora from the squid surface. In addition, they exhibited similar antimicrobial and antibiofilm activities against Vibrio harveyi. This study identified CNMA derivatives as potential broad-spectrum antimicrobial agents to treat biofilm-mediated Vibrio infections and for surface disinfection in food processing facilities.
22
Caburlotto, Greta, Maria M. Lleò, Tamara Hilton, Anwar Huq, Rita R. Colwell y James B. Kaper. "Effect on Human Cells of Environmental Vibrio parahaemolyticus Strains Carrying Type III Secretion System 2". Infection and Immunity 78, n.º 7 (17 de mayo de 2010): 3280–87. http://dx.doi.org/10.1128/iai.00050-10.
Texto completoResumen
ABSTRACT Vibrio parahaemolyticus is an inhabitant of estuarine and marine environments that causes seafood-borne gastroenteritis worldwide. Recently, a type 3 secretion system (T3SS2) able to secrete and translocate virulence factors into the eukaryotic cell has been identified in a pathogenicity island (VP-PAI) located on the smaller chromosome. These virulence-related genes have previously been detected only in clinical strains. Classical virulence genes for this species (tdh, trh) are rarely detected in environmental strains, which are usually considered to lack virulence potential. However, during screening of a collection of environmental V. parahaemolyticus isolates obtained in the North Adriatic Sea in Italy, a number of marine strains carrying virulence-related genes, including genes involved in the T3SS2, were detected. In this study, we investigated the pathogenic potential of these marine V. parahaemolyticus strains by studying their adherence ability, their cytotoxicity, their effect on zonula occludin protein 1 (ZO-1) of the tight junctions, and their effect on transepithelial resistance (TER) in infected Caco-2 cells. By performing a reverse transcription-PCR, we also tested the expression of the T3SS2 genes vopT and vopB2, encoding an effector and a translocon protein, respectively. Our results indicate that, similarly to clinical strains, marine V. parahaemolyticus strains carrying vopT and vopB2 and that other genes included in the VP-PAI are capable of adhering to human cells and of causing cytoskeletal disruption and loss of membrane integrity in infected cells. On the basis of data presented here, environmental V. parahaemolyticus strains should be included in coastal water surveillance plans, as they may represent a risk for human health.
23
Faja, Orooba Meteab, Ali Abd Sharad, Khansa Mohammed Younis, Merriam Ghadhanfar Alwan, Basima Jasim Mohammed y Asmat Ahmad. "Isolation, detection of virulence genes, antibiotic resistance genes, plasmid profile, and molecular typing among Vibrio parahaemolyticus isolated in Malaysian seawater from recreational beaches and fish". July-2019 12, n.º 7 (julio de 2019): 1140–49. http://dx.doi.org/10.14202/vetworld.2019.1140-1149.
Texto completoResumen
Background and Aim: Despite the importance of the global emergence of Vibrio parahaemolyticus infections worldwide, there has been scanty information on its occurrence in Malaysian seawaters and fish. This study aimed to determine the occurrence of V. parahaemolyticus isolates using polymerase chain reaction targeted at toxin operon gene, thermostable direct hemolysin (tdh), and tdh-related hemolysin genes and to determine antibiotic resistance pattern, genes, and plasmid profile of V. parahaemolyticus from Malaysian seawaters and fish. Materials and Methods: Samples were collected from four recreational beaches in Malaysia (Port Klang; Bachok; Port Dickson; and Mersing). Thiosulfate-citrate-bile salts-sucrose (TCBS) agar and chromogenic Vibrio agar were used for isolation and identification. Colonies with yellow color on TCBS and green color on chromogenic vibrio (CV) agar were considered to be V. parahaemolyticus and they were subjected to biochemical tests. All V. parahaemolyticus isolates were further subjected to identification using seven specific gene markers. Results: Seventy-three Vibrio isolates were recovered. Only one gene tdh> from seawater isolates of Vibrio has high virulence gene percentage (95.23%). Two genes alkaline serine protease (asp) and (tdh) had high percentage of virulence (83.87% and 80.64%, respectively) from fish. Comparatively, fish isolates have a higher virulence percentage compared to seawater isolates. Only gene streptomycin resistance B (strB) from seawater had 100% of the resistance genes. All isolates were multi-antibiotic resistant. Seventeen antibiotic resistance patterns were observed. The isolates had plasmids of varying sizes ranging from 2.7 kb to 42.4 kb. Dendrogram based on antibiotic resistance patterns of V. parahaemolyticus isolates discriminated the isolates into three clusters. Conclusion: This study demonstrated the occurrence of pathogenic, multi-antibiotic-resistant V. parahaemolyticus strains in Malaysian coastal waters and fish, and this could constitute potential public health risks.
24
KORALAGE, MADURA SANJEEVANI GONSAL, THOMAS ALTER, DUANGPORN PICHPOL, ECKHARD STRAUCH, KARL-HANS ZESSIN y STEPHAN HUEHN. "Prevalence and Molecular Characteristics of Vibrio spp. Isolated from Preharvest Shrimp of the North Western Province of Sri Lanka". Journal of Food Protection 75, n.º 10 (1 de octubre de 2012): 1846–50. http://dx.doi.org/10.4315/0362-028x.jfp-12-115.
Texto completoResumen
This study investigated the prevalence and molecular characteristics of Vibrio spp. in farmed shrimp (Penaeus monodon) in Sri Lanka. A total of 170 shrimp samples (100 g of whole shrimp each) taken from individual ponds from 54 farms were collected 1 week prior to harvest from the North Western Province of Sri Lanka. Overall, 98.1% of the farms and 95.1% of the ponds were positive for Vibrio spp. in shrimp; at the pond level, V. parahaemolyticus (91.2%) was most common, followed by V. alginolyticus (18.8%), V. cholerae non-O1/non-O139 (4.1%), and V. vulnificus (2.4%). Multiple Vibrio spp. were detected in 20.6% of the ponds. None of the V. parahaemolyticus isolates (n = 419) were positive for the virulence-associated tdh (thermostable direct hemolysin) and trh (TDH-related hemolysin) genes. V. cholerae was confirmed by the presence of ompW, and all isolates (n = 8) were negative for the cholera toxin (ctxA) gene. V. cholerae isolates were serogrouped by PCR and identified as V. cholerae non-O1/non-O139. All four V. vulnificus strains, isolated from different ponds of two geographical regions, showed pathogenic potential; they belonged to vcgC sequence type, type B 16S rRNA genotype and contained a pilF polymorphism associated with human pathogenicity. The results of this study revealed the ubiquitous nature of vibrios in farmed shrimp. To minimize the potential risk of Vibrio infections due to handling or consumption of raw or undercooked seafood products, good manufacturing practices as well as proper handling and processing should be addressed.
25
Shahrear, Sazzad, Maliha Afroj Zinnia, Md Rabi Us Sany y Abul Bashar Mir Md Khademul Islam. "Functional Analysis of Hypothetical Proteins of Vibrio parahaemolyticus Reveals the Presence of Virulence Factors and Growth-Related Enzymes With Therapeutic Potential". Bioinformatics and Biology Insights 16 (enero de 2022): 117793222211360. http://dx.doi.org/10.1177/11779322221136002.
Texto completoResumen
Vibrio parahaemolyticus, an aquatic pathogen, is a major concern in the shrimp aquaculture industry. Several strains of this pathogen are responsible for causing acute hepatopancreatic necrosis disease as well as other serious illness, both of which result in severe economic losses. The genome sequence of two pathogenic strains of V. parahaemolyticus, MSR16 and MSR17, isolated from Bangladesh, have been reported to gain a better understanding of their diversity and virulence. However, the prevalence of hypothetical proteins (HPs) makes it challenging to obtain a comprehensive understanding of the pathogenesis of V. parahaemolyticus. The aim of the present study is to provide a functional annotation of the HPs to elucidate their role in pathogenesis employing several in silico tools. The exploration of protein domains and families, similarity searches against proteins with known function, gene ontology enrichment, along with protein-protein interaction analysis of the HPs led to the functional assignment with a high level of confidence for 656 proteins out of a pool of 2631 proteins. The in silico approach used in this study was important for accurately assigning function to HPs and inferring interactions with proteins with previously described functions. The HPs with function predicted were categorized into various groups such as enzymes involved in small-compound biosynthesis pathway, iron binding proteins, antibiotics resistance proteins, and other proteins. Several proteins with potential druggability were identified among them. In addition, the HPs were investigated in search of virulent factors, which led to the identification of proteins that have the potential to be exploited as vaccine candidate. The findings of the study will be effective in gaining a better understanding of the molecular mechanisms of bacterial pathogenesis. They may also provide an insight into the process of evaluating promising targets for the development of drugs and vaccines against V. parahaemolyticus.
26
Canellas, Anna L. B., Isabelle R. Lopes, Marianne P. Mello, Rodolfo Paranhos, Bruno F. R. de Oliveira y Marinella S. Laport. "Vibrio Species in an Urban Tropical Estuary: Antimicrobial Susceptibility, Interaction with Environmental Parameters, and Possible Public Health Outcomes". Microorganisms 9, n.º 5 (7 de mayo de 2021): 1007. http://dx.doi.org/10.3390/microorganisms9051007.
Texto completoResumen
The genus Vibrio comprises pathogens ubiquitous to marine environments. This study evaluated the cultivable Vibrio community in the Guanabara Bay (GB), a recreational, yet heavily polluted estuary in Rio de Janeiro, Brazil. Over one year, 66 water samples from three locations along a pollution gradient were investigated. Isolates were identified by MALDI-TOF mass spectrometry, revealing 20 Vibrio species, including several potential pathogens. Antimicrobial susceptibility testing confirmed resistance to aminoglycosides, beta-lactams (including carbapenems and third-generation cephalosporins), fluoroquinolones, sulfonamides, and tetracyclines. Four strains were producers of extended-spectrum beta-lactamases (ESBL), all of which carried beta-lactam and heavy metal resistance genes. The toxR gene was detected in all V. parahaemolyticus strains, although none carried the tdh or trh genes. Higher bacterial isolation rates occurred in months marked by higher water temperatures, lower salinities, and lower phosphorus and nitrogen concentrations. The presence of non-susceptible Vibrio spp. was related to indicators of eutrophication and sewage inflow. DNA fingerprinting analyses revealed that V. harveyi and V. parahaemolyticus strains non-susceptible to antimicrobials might persist in these waters throughout the year. Our findings indicate the presence of antimicrobial-resistant and potentially pathogenic Vibrio spp. in a recreational environment, raising concerns about the possible risks of human exposure to these waters.
27
Froelich, Brett A. y Rachel T. Noble. "Vibrio bacteria in raw oysters: managing risks to human health". Philosophical Transactions of the Royal Society B: Biological Sciences 371, n.º 1689 (5 de marzo de 2016): 20150209. http://dx.doi.org/10.1098/rstb.2015.0209.
Texto completoResumen
The human-pathogenic marine bacteria Vibrio vulnificus and V. parahaemolyticus are strongly correlated with water temperature, with concentrations increasing as waters warm seasonally. Both of these bacteria can be concentrated in filter-feeding shellfish, especially oysters. Because oysters are often consumed raw, this exposes people to large doses of potentially harmful bacteria. Various models are used to predict the abundance of these bacteria in oysters, which guide shellfish harvest policy meant to reduce human health risk. Vibrio abundance and behaviour varies from site to site, suggesting that location-specific studies are needed to establish targeted risk reduction strategies. Moreover, virulence potential, rather than simple abundance, should be also be included in future modeling efforts.
28
Shimohata, Takaaki, Kazuaki Mawatari, Hitomi Iba, Masakazu Hamano, Sachie Negoro, Shoko Asada, Mutsumi Aihara, Akiko Hirata, Zehong Su y Akira Takahashi. "VopB1 and VopD1 are essential for translocation of type III secretion system 1 effectors of Vibrio parahaemolyticus". Canadian Journal of Microbiology 58, n.º 8 (agosto de 2012): 1002–7. http://dx.doi.org/10.1139/w2012-081.
Texto completoResumen
Vibrio parahaemolyticus is a pathogenic Vibrio species that causes food-borne acute gastroenteritis, often related to the consumption of raw or undercooked seafood. Vibrio parahaemolyticus has 2 type III secretion systems (T3SS1 and T3SS2). Here, we demonstrate that VP1657 (VopB1) and VP1656 (VopD1), which share sequence similarity with Pseudomonas genes popB (38%) and popD (36%), respectively, are essential for translocation of T3SS1 effectors into host cells. A VP1680CyaA fusion reporter system was constructed to observe effector translocation. Using this reporter assay we showed that the VopB1 and VopD1 deletion strains were unable to translocate VP1680 to host cell but that the secretion of VP1680 into the culture medium was not affected. VopB1 or VopD1 deletion strains did not enhance cytotoxicity and failed to activate mitogen-activated protein kinases and secretion of interleukin-8, which depend on VP1680. Thus, we conclude that VopB1 and VopD1 are essential components of the translocon. To target VopB1 and VopD1 may have therapeutic potential for the treatment or prevention in V. parahaemolyticus infection.
29
Lai, Eric Y. C., Charng-Cherng Chyau, Jeng-Leun Mau, Chien-Chou Chen, Yi-Jui Lai, Ching-Fang Shih y Long-Liu Lin. "Antimicrobial Activity and Cytotoxicity of the Essential Oil of Curcuma zedoaria". American Journal of Chinese Medicine 32, n.º 02 (enero de 2004): 281–90. http://dx.doi.org/10.1142/s0192415x0400193x.
Texto completoResumen
The chemical compositions of the essential oil of Curcuma zedoaria (Berg.) Rosc. were analyzed by gas chromatography-mass spectrometry (GC-MS) and showed a high content of epicurzerenone and curdione representing 46.6% and 13.7% of the total oil, respectively. The essential oil was evaluated for potential antimicrobial activity against Staphylococcus aureus, Escherichia coli, Pseudomonasa aeruginosa, Vibrio parahaemolyticus, Salmonella typhimurium and Bacillus cereus. V. parahaemolyticus was sensitive to the presence of the essential oil, while the most resistant strain appeared to be E. coli. Based on 3- (4,5-dimethylthiazol-2-yl)-2, 5-diphenyl-tetrazolium bromide (MTT) assay, nitroblue tetrazolium (NBT) reduction and cell morphology, the essential oil of C. zedoaria could inhibit the proliferation of human promyelocytic leukemia HL-60 cells. These results suggest that the essential oil has the antimicrobial activity against some of Gram- positive and negative pathogenic microorganisms and the components of the extract lead to the apoptosis of human cancer cell line.
30
Ngan, Wing Yui, Subramanya Rao, Long Chung Chan, Patrick T. Sekoai, Yang Pu, Yuan Yao, Aster Hei Yiu Fung y Olivier Habimana. "Impacts of Wet Market Modernization Levels and Hygiene Practices on the Microbiome and Microbial Safety of Wooden Cutting Boards in Hong Kong". Microorganisms 8, n.º 12 (7 de diciembre de 2020): 1941. http://dx.doi.org/10.3390/microorganisms8121941.
Texto completoResumen
Accessing food through wet markets is a common global daily occurrence, where fresh meat can be purchased to support an urbanizing world population. Similar to the wet markets in many other metropolitan cities in Asia, Hong Kong wet markets vary and are characterized by differing hygiene routines and access to essential modern technologies. The lack of risk assessments of food contact surfaces in these markets has led to substantial gaps in food safety knowledge and information that could help improve and maintain public health. Microbial profiling analyses were conducted on cutting boards that had been used to process pork, poultry, and seafood at 11 different wet markets. The markets differed in hygiene protocols and access to modern facilities. Irrespective of whether wet markets have access of modern infrastructure, the hygiene practices were largely found to be inefficient based on the prevalence of bacterial species typically associated with foodborne pathogens such as Campylobacter fetus, Clostridium perfringens, Staphylococcus aureus, and Vibrio parahaemolyticus; indicator organisms such as Escherichia coli; as well as nonfoodborne pathogenic bacterial species potentially associated with nosocomial infections, such as Klebsiella pneumoniae and Enterobacter cloacae. Other Vibrio species, V. parahaemolyticus and V. vulnificus, typically associated with contaminated raw or undercooked seafood with the potential to cause illness in humans, were also found on wooden cutting boards. This study indicated that the hygienic practices used in Hong Kong wet markets are not sufficient for preventing the establishment of spoilage or pathogenic organisms. This study serves as a basis to review current hygiene practices in wet markets and provides a framework to reassess existing safety protocols.
31
Sahandi, Sorgeloos, Xiao, Wang, Qi, Zheng y Tang. "The Use of Selected Bacteria and Yeasts to Control Vibrio spp. in Live Food". Antibiotics 8, n.º 3 (18 de julio de 2019): 95. http://dx.doi.org/10.3390/antibiotics8030095.
Texto completoResumen
Vibrio species are a significant causative of mass mortality in mariculture worldwide, which can quickly accumulate in live food and transmit into the larval gut. With restrictions on the use of antibiotics in aquaculture, finding a proper solution to reduce the risk of Vibriosis is vital. This study aimed to evaluate the susceptibility of Vibrio harveyi, V. campbellii, V. anguillarum, and V. parahaemolyticus to twenty-six bacterial and yeast strains and use the beneficial ones to enrich live food (Branchiopod, Artemia franciscana, rotifer, Brachionus plicatilis and copepod, Tigriopus japonicus). Thus, a modified disk diffusion method was applied. After a susceptibility assay, the bacteria and yeast beneficial in suppressing the Vibrio species were labeled by fluorescent stain and used to measure the accumulation potential in different live foods. Also, the beneficial bacteria and yeast were used to enrich live foods, and then the count of loaded Vibrio was estimated after 5, 10, 15, and 20 hours by the serial dilution method. From the total bacteria and yeast strains that were used, Candida parapsilosis, Pseudoalteromonas flavipulchra, Lactobacillus sakei, Bacillus natto, and B. amyloliquefaciens inhibited all four Vibrio species. The results of microbial labeling showed that L. sakei in Artemia, C. parapsilosis in rotifers, and V. harveyi in copepods had the highest accumulation rate. The results of the estimation of loaded Vibrio in different live foods also showed that the use of beneficial bacteria and yeast each significantly reduced the count of Vibrio. Application of bacteria and yeast to suppress pathogenic Vibrio maybe a sustainable method for preventing this pathogen from harmfully invading aquaculture and may also aid in reducing the chances of antibiotic resistance in pathogenic Vibrio.
32
VU, THI THU TRA, THOMAS ALTER y STEPHAN HUEHN. "Prevalence of Vibrio spp. in Retail Seafood in Berlin, Germany". Journal of Food Protection 81, n.º 4 (8 de marzo de 2018): 593–97. http://dx.doi.org/10.4315/0362-028x.jfp-17-366.
Texto completoResumen
ABSTRACT This study was conducted to determine the prevalence of Vibrio spp. in retail seafood in Berlin, Germany. A total of 160 raw seafood samples from supermarkets and seafood shops, consisting of shrimp (n = 80) and bivalves (n = 80), were investigated for the presence of Vibrio spp. using the International Organization for Standardization ISO/TS 21872 method and a multiplex PCR. The overall prevalence of Vibrio spp. in retail seafood was 55% (95% CI: 47.2 to 62.8%). The prevalence of Vibrio spp. in shrimp was slightly higher than in bivalves (57.5 versus 52.5%); however, the difference was not statistically significant. Vibrio alginolyticus was the most prevalent species (35.6%), followed by Vibrio parahaemolyticus (27.5%), Vibrio cholerae (6.3%), and Vibrio vulnificus (0.6%). None of the V. parahaemolyticus (n = 110) isolates encoded tdh/trh genes, whereas all V. cholerae isolates (n = 27) were lacking ctxA. Among the chilled samples (n = 105), the prevalence of Vibrio spp. in unpacked samples was significantly higher than in packed samples (P = 0.006). Among the packed samples (n = 55), no significant difference in the prevalence of Vibrio spp. was observed between chilled or frozen products. The results of this study indicated a high prevalence of Vibrio spp. in retail seafood in Germany; positive samples were detected in all types of seafood investigated. The detection of tdh/trh-negative V. parahaemolyticus isolates should not be neglected because of previous findings on pathogenic strains lacking these virulence markers. Even though thorough cooking might limit the risk of foodborne illness caused by Vibrio, potential cross-contamination during preparation or consumption of raw and undercooked seafood might represent a risk of Vibrio infections.
33
Triwibowo, Radestya, Novalia Rachmawati y Dwiyitno Dwiyitno. "Rapid and Simultaneous Detection of Vibrio parahaemolyticus, Salmonella spp. and Escherichia coli in Fish by Multiplex PCR". Squalen Bulletin of Marine and Fisheries Postharvest and Biotechnology 15, n.º 2 (27 de agosto de 2020): 53. http://dx.doi.org/10.15578/squalen.v15i2.444.
Texto completoResumen
Pathogenic bacteria are commonly found as natural contaminants in seafood and fish products. Globally, several countries have been imposing strict regulations on the maximum levels of pathogens and consequently require microbial testing of pathogens before the products can be marketed. A culture-based method with biochemical assay has been widely used to detect pathogenic bacteria in food, despite its long and extensive process. Meanwhile, the alternative molecular-based method to overcome this problem, cannot differentiate between viable and nonviable cells, which may lead to underestimation. This study aimed to develop a multiplex PCR (mPCR) method as a confirmatory assay for the culture-based method to detect pathogens in fish products simultaneously. This method applied a pre-enrichment step to ensure the growth of low-level pathogens and the injured cells in the sample. The target genes were ToxR, InvA, and UidA for Vibrio parahaemolyticus, Salmonella spp. and Escherichia coli, respectively. This assay also amplified the 16S rDNA gene of bacteria as an internal control for the PCR reaction. By implementing liquid-based DNA extraction during analysis, the developed-mPCR was comparable to detect the targeted bacteria in artificially-contaminated samples. The method was more sensitive in naturally-contaminated samples, where the number of E. coli, Salmonella spp. and V. parahaemolyticus detected were 28, 7, and 22, respectively. While the conventional method only detected 26, 5, and 19 of the respective pathogens. With a relatively shorter time and lower operation cost, the mPCR method is potential as an alternative for the culture-based method.
34
Kalpy J., Coulibaly, Vakou N. Sabine, Diaby Aboubakar S., Amon lydie N., Djaman Allico J., N'Diaye Mady y Dosso Mireille. "Resistance Profile of Vibrio spp. Strains Collected from Lagoon Bays and Wastewater in the City of Abidjan, Côte d'Ivoire, from January to June 2017". Open Microbiology Journal 14, n.º 1 (15 de diciembre de 2020): 297–303. http://dx.doi.org/10.2174/1874434602014010297.
Texto completoResumen
Background: Lagoons and wastewater constitute aquatics environments which receive or accounts for most domestic discharges. These waters constitute an important ecosystem for the proliferation of microorganisms. The microorganisms that harbor these waters can provide information on the persistence of certain diseases in the human population, including gastrointestinal infections such as Cholera. The genus Vibrio contains pathogenic aquatic bacteria found in lagoon bays and wastewater. Objective: The main objectives of this work were to confirm the presence of Vibrio spp. in lagoon bays and sewage of the city of Abidjan over the entire interepidemic period, and to evaluate their sensitivity to commonly used antibiotics. Methods: The isolation and identification of the microorganisms were carried out using classical bacteriological techniques (biochemical test, API 20E gallery). When necessary, serotyping was carried out using agglutination tests on slides. Antibiotic susceptibility testing was carried out using the Kirby-Bauer disk diffusion (KBDD) method. Results: This study identified 12 bacterial strains, 9/12 (75%) of which were Vibrio sp. strains. Two Vibrio species, namely Vibrio parahaemolyticus 2/9 (22%) and 7/9 Vibrio cholerae (78%) were identified. V. cholerae was isolated from both sewage and lagoon waters with dominance of serotype O1. The V. cholerae O1 and non-O1 strains showed a high level of resistance to sulfonamides, quinolones, fluoroquinolones, and moderate sensitivity to penicillins and tetracyclines. Resistant V. parahaemolyticus strains were also identified. Conclusion: The increased resistance of these bacteria could pose potential problems in the treatment of epidemics and other communicable diseases. The emergence of these multi-drug resistant strains of the genus Vibrio should prompt the Ivorian health authorities to maintain an epidemiological surveillance network for waterborne diseases throughout the country and to continue bacteriological sampling to monitor Vibrio's sensitivity to antibiotics.
35
KIM, MIN-JEONG, EUN SEOB LIM y JOO-SUNG KIM. "Enzymatic Inactivation of Pathogenic and Nonpathogenic Bacteria in Biofilms in Combination with Chlorine". Journal of Food Protection 82, n.º 4 (25 de marzo de 2019): 605–14. http://dx.doi.org/10.4315/0362-028x.jfp-18-244.
Texto completoResumen
ABSTRACT This study investigated the effects of enzyme application on biofilms of bacterial isolates from a cafeteria kitchen and foodborne pathogens and the susceptibility of Salmonella biofilms to proteinase K combined with chlorine treatment. For four isolates from a cafeteria kitchen (Acinetobacter, Enterobacter, and Kocuria) and six strains of foodborne pathogens (Salmonella enterica, Staphylococcus aureus, and Vibrio parahaemolyticus), the inhibitory effect of enzymes on biofilm formation at 25°C for 24 h or the degradative efficacy of enzymes on 24-h mature biofilm at 37°C for 1 h in tryptic soy broth (TSB) was examined in a polystyrene microtiter plate. The effect of enzymes was also evaluated on a subset of these strains in 20 times diluted TSB (1/20 TSB) at 25°C. The working concentrations of five enzymes were 1 U/100 μL for α-amylase, amyloglucosidase, cellulase, and DNase and 1 milli-Anson unit/100 μL for proteinase K. In addition, 24-h mature Salmonella Typhimurium biofilm on a stainless steel coupon was treated with proteinase K for 1 h at 25°C followed by 20 ppm of chlorine for 1 min at 25°C. The results showed that certain enzymes inhibited biofilm formation by the kitchen-originated bacteria; however, the enzymatic effect was diminished on the mature biofilms. Biofilm formation of V. parahaemolyticus was suppressed by all tested enzymes, whereas the mature biofilm was degraded by α-amylase, DNase I, and proteinase K. Proteinase K was effective in controlling Salmonella biofilms, whereas a strain-dependent variation was observed in S. aureus biofilms. In 1/20 TSB, Enterobacter cancerogenus and Kocuria varians were more susceptible to certain enzymes during biofilm formation than those in TSB, whereas the enzymatic effect was much decreased on 24-h mature biofilms, regardless of nutrient conditions. Furthermore, synergistic inactivation of Salmonella Typhimurium in biofilms was observed in the combined treatment of proteinase K followed by chlorine. Live/Dead assays also revealed a decrease in density and loss of membrane integrity in Salmonella Typhimurium biofilms exposed to the combined treatment. Therefore, certain enzymes can control biofilms of isolates residing in a cafeteria kitchen and foodborne pathogens. This study demonstrates the potential of enzymes for the sanitation of food processing environments and of proteinase K combined with chlorine to control Salmonella biofilms on food contact surfaces.
36
DePaola, Angelo, Jodie Ulaszek, Charles A. Kaysner, Bradley J. Tenge, Jessica L. Nordstrom, Joy Wells, Nancy Puhr y Steven M. Gendel. "Molecular, Serological, and Virulence Characteristics of Vibrio parahaemolyticus Isolated from Environmental, Food, and Clinical Sources in North America and Asia". Applied and Environmental Microbiology 69, n.º 7 (julio de 2003): 3999–4005. http://dx.doi.org/10.1128/aem.69.7.3999-4005.2003.
Texto completoResumen
ABSTRACT Potential virulence attributes, serotypes, and ribotypes were determined for 178 pathogenic Vibrio parahaemolyticus isolates from clinical, environmental, and food sources on the Pacific, Atlantic, and Gulf Coasts of the United States and from clinical sources in Asia. The food and environmental isolates were generally from oysters, and they were defined as being pathogenic by using DNA probes to detect the presence of the thermostable direct hemolysin (tdh) gene. The clinical isolates from the United States were generally associated with oyster consumption, and most were obtained from outbreaks in Washington, Texas, and New York. Multiplex PCR was used to confirm the species identification and the presence of tdh and to test for the tdh-related hemolysin trh. Most of the environmental, food, and clinical isolates from the United States were positive for tdh, trh, and urease production. Outbreak-associated isolates from Texas, New York, and Asia were predominantly serotype O3:K6 and possessed only tdh. A total of 27 serotypes and 28 ribogroups were identified among the isolates, but the patterns of strain distribution differed between the serotypes and ribogroups. All but one of the O3:K6 isolates from Texas were in a different ribogroup from the O3:K6 isolates from New York or Asia. The O3:K6 serotype was not detected in any of the environmental and food isolates from the United States, and none of the food or environmental isolates belonged to any of the three ribogroups that contained all of the O3:K6 and related clinical isolates. The combination of serotyping and ribotyping showed that the Pacific Coast V. parahaemolyticus population appeared to be distinct from that of either the Atlantic Coast or Gulf Coast. The fact that certain serotypes and ribotypes contained both clinical and environmental isolates while many others contained only environmental isolates implies that certain serotypes or ribotypes are more relevant for human disease.
37
Hendra, Rudi, Rohimatul Khodijah, Muhammad Almurdani, Yuli Haryani, Ari Satia Nugraha, Neni Frimayanti, Hilwan Yuda Teruna y Rizky Abdulah. "Free Radical Scavenging, Anti-Infectious, and Toxicity Activities from Stenochlaena palustris (Burm.f.) Bedd. Extracts". Advances in Pharmacological and Pharmaceutical Sciences 2022 (1 de noviembre de 2022): 1–8. http://dx.doi.org/10.1155/2022/5729217.
Texto completoResumen
Stenochlaena palustris (Burm.f.) Bedd. (Blechnaceae) or Kelakai is a traditional medicinal plant found in the Indonesian islands of Borneo and Sumatra. It has been used to treat wound healing, infection, and diabetes. This study looked into the free radical scavenging activity, antiplasmodial activity, toxicity, and antibacterial activity against pathogenic bacteria. The species’ aerial part was extracted with methanol, followed by a liquid-liquid extraction against (n-hexane, dichloromethane, and ethyl acetate). The extracts’ free radical scavenging activities were determined using DPPH and NO radicals. The antiplasmodial and toxicity assays were conducted using two Plasmodium falciparum strains (3D7 and W2) and the brine shrimp lethality test. In addition, antibacterial activity was determined using the well diffusion method. The results revealed that ethyl acetate depicted potential activities toward the assay. The ethyl acetate showed potential free radical scavenging activities with an IC50 value of 51.63 ± 0.46 μg/mL (DPPH) and 60.03 ± 0.65 μg/mL (NO). The antiplasmodial activities showed that the ethyl acetate had potential activities among the extracts with an IC50 value of 11.06 ± 0.45 μg/mL. However, all the extracts demonstrated nontoxic toward Artemia salina with LC50 > 1000 μg/mL. Furthermore, the ethyl acetate demonstrated intermediate susceptibility against B. cereus ATCC 10876, V. parahaemolyticus ATCC 17802, L. monocytogenes ATCC 7644, and S. Typhimurium ATCC 14028 at a concentration of 500 μg/disc. According to these findings, the ethyl acetate extract of S. palustris (Burm.f.) Bedd is a promising source of natural antioxidants and antiplasmodial agents.
38
Cruz, C. D., D. Hedderley y G. C. Fletcher. "Long-Term Study of Vibrio parahaemolyticus Prevalence and Distribution in New Zealand Shellfish". Applied and Environmental Microbiology 81, n.º 7 (23 de enero de 2015): 2320–27. http://dx.doi.org/10.1128/aem.04020-14.
Texto completoResumen
ABSTRACTThe food-borne pathogenVibrio parahaemolyticushas been reported as being present in New Zealand (NZ) seawaters, but there have been no reported outbreaks of food-borne infection from commercially grown NZ seafood. Our study determined the current incidence ofV. parahaemolyticusin NZ oysters and Greenshell mussels and the prevalence ofV. parahaemolyticustdhandtrhstrains. Pacific (235) and dredge (21) oyster samples and mussel samples (55) were obtained from commercial shellfish-growing areas between December 2009 and June 2012. TotalV. parahaemolyticusnumbers and the presence of pathogenic genestdhandtrhwere determined using the FDA most-probable-number (MPN) method and confirmed using PCR analysis. In samples from the North Island of NZ,V. parahaemolyticuswas detected in 81% of Pacific oysters and 34% of mussel samples, while the numbers ofV. parahaemolyticustdhandtrhstrains were low, with just 3/215 Pacific oyster samples carrying thetdhgene.V. parahaemolyticusorganisms carryingtdhandtrhwere not detected in South Island samples, andV. parahaemolyticuswas detected in just 1/21 dredge oyster and 2/16 mussel samples. Numbers ofV. parahaemolyticusorganisms increased when seawater temperatures were high, the season when most commercial shellfish-growing areas are not harvested. The numbers ofV. parahaemolyticusorganisms in samples exceeded 1,000 MPN/g only when the seawater temperatures exceeded 19°C, so this environmental parameter could be used as a trigger warning of potential hazard. There is some evidence that the totalV. parahaemolyticusnumbers increased compared with those reported from a previous 1981 to 1984 study, but the analytical methods differed significantly.
39
Jesser, Kelsey J. y Rachel T. Noble. "VibrioEcology in the Neuse River Estuary, North Carolina, Characterized by Next-Generation Amplicon Sequencing of the Gene Encoding Heat Shock Protein 60 (hsp60)". Applied and Environmental Microbiology 84, n.º 13 (20 de abril de 2018): e00333-18. http://dx.doi.org/10.1128/aem.00333-18.
Texto completoResumen
ABSTRACTOf marine eubacteria, the genusVibriois intriguing because member species are relevant to both marine ecology and human health. Many studies have touted the relationships ofVibrioto environmental factors, especially temperature and salinity, to predict totalVibrioabundance but lacked the taxonomic resolution to identify the relationships among species and the key drivers ofVibriodynamics. To improve next-generation sequencing (NGS) surveys ofVibrio, we have conducted both 16S small subunit rRNA and heat shock protein 60 (hsp60) amplicon sequencing of water samples collected at two well-studied locations in the Neuse River Estuary, NC. Samples were collected between May and December 2016 with enhanced sampling efforts in response to two named storms. Usinghsp60sequences, 21Vibriospecies were identified, including the potential human pathogensV. cholerae,V. parahaemolyticus, andV. vulnificus. Changes in theVibriocommunity mirrored seasonal and storm-related changes in the water column, especially in response to an influx of nutrient-rich freshwater to the estuary after Hurricane Matthew, which initiated dramatic changes in the overallVibriocommunity. Individual species dynamics were wide ranging, indicating that individualVibriotaxa have unique ecologies and that totalVibrioabundance predictors are insufficient for risk assessments of potentially pathogenic species. Positive relationships betweenVibrio, dinoflagellates, andCyanobacteriawere identified, as were intraspecies associations, which further illuminated the interactions of cooccurringVibriotaxa along environmental gradients.IMPORTANCEThe objectives of this research were to utilize a novel approach to improve sequence-based surveys ofVibriocommunities and to demonstrate the usefulness of this approach by presenting an analysis ofVibriodynamics in the context of environmental conditions, with a particular focus on species that cause disease in humans and on storm effects. The methods presented here enabled the analysis ofVibriodynamics with excellent taxonomic resolution and could be incorporated into future ecological studies and risk prediction strategies for potentially pathogenic species. Next-generation sequencing ofhsp60and other innovative sequence-based approaches are valuable tools and show great promise for studyingVibrioecology and associated public health risks.
40
Maje, Mpho Defney, Christ Donald Kaptchouang Tchatchouang, Madira Coutlyne Manganyi, Justine Fri y Collins Njie Ateba. "Characterisation of Vibrio Species from Surface and Drinking Water Sources and Assessment of Biocontrol Potentials of Their Bacteriophages". International Journal of Microbiology 2020 (4 de agosto de 2020): 1–15. http://dx.doi.org/10.1155/2020/8863370.
Texto completoResumen
The aim of this study was to characterise Vibrio species of water samples collected from taps, boreholes, and dams in the North West province, South Africa, and assess biocontrol potentials of their bacteriophages. Fifty-seven putative Vibrio isolates were obtained on thiosulfate-citrate-bile-salt-sucrose agar and identified using biochemical tests and species-specific PCRs. Isolates were further characterised based on the presence of virulence factors, susceptibility to eleven antibiotics, and biofilm formation potentials. Twenty-two (38.60%) isolates were confirmed as Vibrio species, comprising V. harveyi (45.5%, n = 10), V. parahaemolyticus (22.7%, n = 5), V. cholerae (13.6%, n = 3), V. mimicus (9.1%, n = 2), and V. vulnificus (9.1%, n = 2). Three of the six virulent genes screened were positively amplified; four V. parahaemolyticus possessed the tdh (18.18%) and trh (18.18%) genes, while the zot gene was harboured by 3 V. cholerae (13.64%) and one V. mimicus (4.55%) isolate. Isolates revealed high levels of resistance to cephalothin (95.45%), ampicillin (77.27%), and streptomycin (40.91%), while lower resistances (4.55%–27.27%) were recorded for other antimicrobials. Sixteen (72.7%) isolates displayed multiple antibiotic-resistant properties. Cluster analysis of antibiotic resistance revealed a closer relationship between Vibrio isolates from different sampling sites. The Vibrio species displayed biofilm formation potentials at 37°C (63.6, n = 14), 35°C (50%, n = 11), and 25°C (36.4%, n = 8). Two phages isolated in this study (vB_VpM_SA3V and vB_VcM_SA3V) were classified as belonging to the family Myoviridae based on electron microscopy. These were able to lyse multidrug-resistant V. parahaemolyticus and V. cholerae strains. These findings not only indicate the presence of antibiotic-resistant virulent Vibrio species from dam, borehole, and tap water samples that could pose a health risk to humans who either come in contact with or consume water but also present these lytic phages as alternative agents that can be exploited for biological control of these pathogenic strains.
41
Haldar, Soumya, Shruti Chatterjee, Norihiko Sugimoto, Surajit Das, Nityananda Chowdhury, Atsushi Hinenoya, Masahiro Asakura y Shinji Yamasaki. "Identification of Vibrio campbellii isolated from diseased farm-shrimps from south India and establishment of its pathogenic potential in an Artemia model". Microbiology 157, n.º 1 (1 de enero de 2011): 179–88. http://dx.doi.org/10.1099/mic.0.041475-0.
Texto completoResumen
Shrimp diseases are frequently reported to be caused by closely related vibrios, and in many cases they are tentatively but inaccurately identified as Vibrio harveyi and related vibrios. In the present study, 28 biochemically identified V. harveyi-related strains isolated from diseased shrimps were randomly selected for further characterization by molecular tools. Twenty-six strains were identified as Vibrio campbellii and two as V. harveyi by sequence analysis of 16S rRNA and uridylate kinase genes. Haemolysin-gene-based species-specific multiplex PCR also confirmed these results. Experimental challenge studies using Artemia as a model showed that eight isolates were highly pathogenic, three were moderately pathogenic and the remaining 17 were non-pathogenic. Ribotyping with BglI clearly distinguished V. campbellii from V. harveyi, but it failed to separate pathogenic and non-pathogenic clusters. Artemia nauplii challenged with a fluorescently labelled highly pathogenic strain (IPEY54) showed patches in the digestive tract. However, no patches were observed for a non-pathogenic strain (IPEY41). Direct bacterial counts also supported colonization potential for the highly pathogenic strain. To our knowledge, this is the first report on the isolation and accurate identification of large numbers of V. campbellii associated with shrimp disease in aquacultural farms. V. campbellii has long been considered to be non-pathogenic and classified with V. harveyi-related bacteria. However, we show that this species may be an emerging aquaculture pathogen. This study will help to formulate suitable strategies to combat this newly identified pathogen.
42
Hagbani, Turki Al, Hemant Yadav, Afrasim Moin, Amr Selim Abu Lila, Khalid Mehmood, Farhan Alshammari, Salman Khan et al. "Enhancement of Vancomycin Potential against Pathogenic Bacterial Strains via Gold Nano-Formulations: A Nano-Antibiotic Approach". Materials 15, n.º 3 (31 de enero de 2022): 1108. http://dx.doi.org/10.3390/ma15031108.
Texto completoResumen
The remarkable rise of antibiotic resistance among pathogenic bacteria poses a significant threat to human health. Nanoparticles (NPs) have recently emerged as novel strategies for conquering fatal bacterial diseases. Furthermore, antibiotic-functionalized metallic NPs represent a viable nano-platform for combating bacterial resistance. In this study, we present the use of vancomycin-functionalized gold nanoparticles (V-GNPs) to battle pathogenic bacterial strains. A facile one-pot method was adopted to synthesize vancomycin-loaded GNPs in which the reducing properties of vancomycin were exploited to produce V-GNPs from gold ions. UV–Visible spectroscopy verified the production of V-GNPs via the existence of a surface plasmon resonance peak at 524 nm, whereas transmission electron microscopy depicted a size of ~24 nm. Further, dynamic light scattering (DLS) estimated the hydrodynamic diameter as 77 nm. The stability of V-GNPs was investigated using zeta-potential measurements, and the zeta potential of V-GNPs was found to be −18 mV. Fourier transform infrared spectroscopy confirmed the efficient loading of vancomycin onto GNP surfaces; however, the loading efficiency of vancomycin onto V-GNPs was 86.2%. Finally, in vitro antibacterial studies revealed that V-GNPs were much more effective, even at lower concentrations, than pure vancomycin. The observed antibacterial activities of V-GNPs were 1.4-, 1.6-, 1.8-, and 1.6-fold higher against Gram-negative Escherichia coli, Klebsiella oxytoca, and Pseudomonas aeruginosa and Gram-positive Staphylococcus aureus, respectively, compared to pure vancomycin. Collectively, V-GNPs represented a more viable alternative to pure vancomycin, even at a lower antibiotic dose, in conquering pathogenic bacteria.
43
Limpanasithikul, W., S. Ray y B. Diamond. "Cross-reactive antibodies have both protective and pathogenic potential." Journal of Immunology 155, n.º 2 (15 de julio de 1995): 967–73. http://dx.doi.org/10.4049/jimmunol.155.2.967.
Texto completoResumen
Abstract We report the characteristics of five IgM anti-phosphorylcholine (PC) Abs derived from nonautoimmune BALB/c mice. These Abs were chosen on the basis of their unique ability to cross-react with dsDNA. Three Abs protect mice from a lethal pneumococcal infection, and all five Abs deposit in glomeruli and cause renal dysfunction. Analysis of V region gene usage shows that none of the Abs is encoded by the V1 gene segment used to encode the dominant T15+ anti-PC response typically expressed in serum of PC-immunized BALB/c mice. The demonstration of the existence of noncanonical protective anti-PC Abs that also display pathogenic autoreactivity suggests that idiotypically restricted responses may serve to prevent the expression of Abs that react with both foreign and self Ags and so help maintain self-tolerance.
44
Zokaityte, Egle, Vita Lele, Vytaute Starkute, Paulina Zavistanaviciute, Modestas Ruzauskas, Erika Mozuriene, Marina Cepiene et al. "Antimicrobial Potential of Beverages Preparation Based on Fermented Milk Permeate and Berries/Vegetables". Beverages 6, n.º 4 (19 de noviembre de 2020): 65. http://dx.doi.org/10.3390/beverages6040065.
Texto completoResumen
Nowadays, taking into consideration the current dynamics of drug resistance development, many researchers are working to develop new antimicrobial compound combinations for the food and beverage industry, which can overcome this problem. The aim of this study was to evaluate the antimicrobial properties of milk permeate fermented with Lactobacillus plantarum LUHS135, Lactobacillus plantarum LUHS122, and Lactobacillus faraginis LUHS206 strains in combination with berry/vegetable (B/V) pomace (gooseberries, chokeberries, cranberries, sea buckthorn, rhubarb) against a variety of pathogenic strains (methicillin-resistant Staphylococcus aureus, Citrobacter freundii, Klebsiella pneumoniae, Salmonella enterica, Bacillus cereus, Pseudomonas aeruginosa, Acinetobacter baumanni, Proteus mirabilis, Enterococcus faecalis, Enterococcus faecium, Streptococcus mutans, Streptococcus epidermis, Staphylococcus haemolyticus, Pasteurella multocida, and Enterobacter cloacae) as a potential antimicrobial combination for beverage preparation. The highest number of the tested pathogenic strains was inhibited by gooseberries, sea buckthorn, and rhubarb combinations with strain LUHS122 fermented beverages (13 pathogens out of 15 tested). Twelve out of 15 tested pathogens were inhibited by gooseberry combinations with LUHS135 and LUHS206 fermented milk permeate. Selected B/V in combination with fermented milk permeate are promising antimicrobial ingredients for beverage preparation, possessing antimicrobial activity almost against all the tested pathogenic strains.
45
Li, Xuejing, Yantao Liang, Zhenhua Wang, Yanyan Yao, Xiaoli Chen, Anran Shao, Longfei Lu y Hongyue Dang. "Isolation and Characterization of a Novel Vibrio natriegens—Infecting Phage and Its Potential Therapeutic Application in Abalone Aquaculture". Biology 11, n.º 11 (17 de noviembre de 2022): 1670. http://dx.doi.org/10.3390/biology11111670.
Texto completoResumen
Phage-based pathogen control (i.e., phage therapy) has received increasing scientific attention to reduce and prevent the emergence, transmission, and detrimental effects of antibiotic resistance. In the current study, multidrug-resistant Vibrio natriegens strain AbY-1805 was isolated and tentatively identified as a pathogen causing the death of juvenile Pacific abalones (Haliotis discus hannai Ino). In order to apply phage therapy, instead of antibiotics, to treat and control V. natriegens infections in marine aquaculture environments, a lytic phage, vB_VnaS-L3, was isolated. It could effectively infect V. natriegens AbY-1805 with a short latent period (40 min) and high burst size (~890 PFU/cell). Treatment with vB_VnaS-L3 significantly reduced the mortality of juvenile abalones and maintained abalone feeding capacity over a 40-day V. natriegens challenge experiment. Comparative genomic and phylogenetic analyses suggested that vB_VnaS-L3 was a novel marine Siphoviridae-family phage. Furthermore, vB_VnaS-L3 had a narrow host range, possibly specific to the pathogenic V. natriegens strains. It also exhibited viability at a wide range of pH, temperature, and salinity. The short latent period, large burst size, high host specificity, and broad environmental adaptation suggest that phage vB_VnaS-L3 could potentially be developed as an alternative antimicrobial for the control and prevention of marine animal infections caused by pathogenic V. natriegens.
46
Faruque, Shah M., M. Kamruzzaman, Ismail M. Meraj, Nityananda Chowdhury, G. Balakrish Nair, R. Bradley Sack, Rita R. Colwell y David A. Sack. "Pathogenic Potential of Environmental Vibrio cholerae Strains Carrying Genetic Variants of the Toxin-Coregulated Pilus Pathogenicity Island". Infection and Immunity 71, n.º 2 (febrero de 2003): 1020–25. http://dx.doi.org/10.1128/iai.71.2.1020-1025.2003.
Texto completoResumen
ABSTRACT The major virulence factors of toxigenic Vibrio cholerae are cholera toxin (CT), which is encoded by a lysogenic bacteriophage (CTXΦ), and toxin-coregulated pilus (TCP), an essential colonization factor which is also the receptor for CTXΦ. The genes for the biosynthesis of TCP are part of a larger genetic element known as the TCP pathogenicity island. To assess their pathogenic potential, we analyzed environmental strains of V. cholerae carrying genetic variants of the TCP pathogenicity island for colonization of infant mice, susceptibility to CTXΦ, and diarrheagenicity in adult rabbits. Analysis of 14 environmental strains, including 3 strains carrying a new allele of the tcpA gene, 9 strains carrying a new allele of the toxT gene, and 2 strains carrying conventional tcpA and toxT genes, showed that all strains colonized infant mice with various efficiencies in competition with a control El Tor biotype strain of V. cholerae O1. Five of the 14 strains were susceptible to CTXΦ, and these transductants produced CT and caused diarrhea in adult rabbits. These results suggested that the new alleles of the tcpA and toxT genes found in environmental strains of V. cholerae encode biologically active gene products. Detection of functional homologs of the TCP island genes in environmental strains may have implications for understanding the origin and evolution of virulence genes of V. cholerae.
47
Islam, Atiqul, Maurizio Labbate, Steven P. Djordjevic, Munirul Alam, Aaron Darling, Jacqueline Melvold, Andrew J. Holmes et al. "Indigenous Vibrio cholerae strains from a non-endemic region are pathogenic". Open Biology 3, n.º 2 (febrero de 2013): 120181. http://dx.doi.org/10.1098/rsob.120181.
Texto completoResumen
Of the 200+ serogroups of Vibrio cholerae , only O1 or O139 strains are reported to cause cholera, and mostly in endemic regions. Cholera outbreaks elsewhere are considered to be via importation of pathogenic strains. Using established animal models, we show that diverse V. cholerae strains indigenous to a non-endemic environment (Sydney, Australia), including non-O1/O139 serogroup strains, are able to both colonize the intestine and result in fluid accumulation despite lacking virulence factors believed to be important. Most strains lacked the type three secretion system considered a mediator of diarrhoea in non-O1/O13 V. cholerae . Multi-locus sequence typing (MLST) showed that the Sydney isolates did not form a single clade and were distinct from O1/O139 toxigenic strains. There was no correlation between genetic relatedness and the profile of virulence-associated factors. Current analyses of diseases mediated by V. cholerae focus on endemic regions, with only those strains that possess particular virulence factors considered pathogenic. Our data suggest that factors other than those previously well described are of potential importance in influencing disease outbreaks.
48
Bailey, S. N. y N. Rosenberg. "Assessing the pathogenic potential of the V(D)J recombinase by interlocus immunoglobulin light-chain gene rearrangement." Molecular and Cellular Biology 17, n.º 2 (febrero de 1997): 887–94. http://dx.doi.org/10.1128/mcb.17.2.887.
Texto completoResumen
Chromosomal translocations involving antigen receptor genes and oncogenes have been observed in several forms of lymphoid malignancy. Observations of their lymphocyte-restricted occurrence and a molecular analysis of some translocation breakpoints have suggested that some of these rearrangements are generated by V(D)J recombinase activity. However, a direct correlation between this activity and the generation of such rearrangements has never been established. In addition, because these aberrant rearrangements are usually detected only after a tumor has been formed, the frequency with which the recombinase machinery generates translocations has never been assessed directly. To approach these issues, immunoglobulin light-chain gene rearrangements were induced in pre-B cells transformed by temperature-sensitive mutants of Abelson murine leukemia virus and PCR was used to identify interlocus recombinants. Vlambda Jkappa and Vkappa Jlambda rearrangements as well as signal joints resulting from the recombination of Vlambda and Jkappa coding elements were recovered and were found to be similar in structure to conventional intrachromosomal joints. Because these products were detected only when the cells were undergoing active intralocus rearrangement, they provide direct evidence that translocations can be generated by the V(D)J recombinase machinery. Dilution analyses revealed that interlocus rearrangements occur about 1,000 times less frequently than conventional intralocus rearrangements. Considering the large numbers of lymphocytes generated throughout life, aberrant rearrangements generated by the V(D)J recombinase may be relatively common.
49
Lee, Po-Tsang, Jim Huang y Fan-Hua Nan. "Inactivated Whole Vaccine Inhibits Lethal Vibrio harveyi Infection in Oplegnathus punctatus". Journal of Marine Science and Engineering 10, n.º 5 (2 de mayo de 2022): 625. http://dx.doi.org/10.3390/jmse10050625.
Texto completoResumen
Aquaculture plays a key role in food production globally and provides a valuable source of protein and nutrition, addressing a worldwide growing demand. Oplegnathus punctatus (spotted knifejaw) is an economically important fish species with a high market value and demand. Previous studies on O. punctatus focused mainly on gonadal development, chromosomal microstructure, selective breeding, characterization of immune genes, and viral diseases. There is no published scientific research regarding vibriosis in this fish species. In this study, two potential pathogenic bacteria, Vibrio harveyi and Enterococcus gallinarum, were isolated from moribund cultured O. punctatus. The sequence of the universal 16S rDNA gene was used to identify potential pathogenic bacteria isolated from the moribund O. punctatus, and morphological assessments and API20E tests of the bacterial isolates were conducted to verify the identity and biochemical characteristics of the isolates. Injection of E. gallinarum did not lead to mortality in O. punctatus during the 21 days of observation. In contrast, fish died overnight when challenged with V. harveyi at 1.25 × 105 CFU/g body weight, suggesting that the cause of death of the cultured O. punctatus was V. harveyi infection. Antimicrobial sensitivity analyses revealed that the V. harveyi strain NTOU is sensitive to flumequine, doxycycline, oxolinic acid, and amoxycillin. Importantly, we demonstrated for the first time that intraperitoneal administration of an inactivated V. harveyi whole-cell vaccine resulted in a high level of protection against V. harveyi infection in O. punctatus.
50
Shanahan, Fergus. "V. Mechanisms of immunologic sensation of intestinal contents". American Journal of Physiology-Gastrointestinal and Liver Physiology 278, n.º 2 (1 de febrero de 2000): G191—G196. http://dx.doi.org/10.1152/ajpgi.2000.278.2.g191.
Texto completoResumen
Immune perception of intestinal contents reflects a functional dualism with systemic hyporesponsiveness to dietary antigens and resident microflora (oral tolerance) and active immune responses to mucosal pathogens. This facilitates optimal absorption of dietary nutrients while conserving immunologic resources for episodic pathogenic challenge. Discrimination between dangerous and harmless antigens within the enteric lumen requires continual sampling of the microenvironment by multiple potential pathways, innate and adaptive recognition mechanisms, bidirectional lymphoepithelial signaling, and rigorous control of effector responses. Errors in these processes disrupt mucosal homeostasis and are associated with food hypersensitivity and mucosal inflammation. Mechanisms of mucosal immune perception and handling of dietary proteins and other antigens have several practical and theoretical implications including vaccine design, therapy of systemic autoimmunity, and alteration of enteric flora with probiotics.