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Literatura académica sobre el tema "Bacteriophage, Staphylococcic"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 28 de enero de 2023

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Artículos de revistas sobre el tema "Bacteriophage, Staphylococcic"

Kharaeva, Z. F., M. Sh Mustafaev, L. Z. Blieva, E. B. Barokova, S. M. Mustafaeva y S. A. Dyshekova. "Evaluation of sensitivity to bacteriophages of strains isolated from children with congenital malformations of the maxillofacial region". REPORTS ADYGE (CIRCASSIAN) INTERNATIONAL ACADEMY OF SCIENCES 20, n.º 1 (2020): 40–45. http://dx.doi.org/10.47928/1726-9946-2020-20-1-40-45.

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Bacteriophage are used in clinical practice along with antibiotics. It is known that in many cases phage drugs are superior to other antibacterial drugs in their activity against antibiotic-resistant pathogens. Bacteriophages do not cause toxic or allergic side effects and have no contraindications.The use of bacteriophage preparations stimulates the activation of adaptive and innate immune factors, so phage therapy is particularly effective in the treatment of chronic inflammatory diseases against the background of immunosuppressive States. Bacteriophages do not interfere with the implementation of the therapeutic effect of other drugs (antibiotics, probiotics, synbiotics) and are not sensitive to their effects. The paper evaluates the sensitivity of different types of staphylococci and streptococci to specific bacteriophages, as well as to sextaphage - polyvalent piobacteriophage. In the course of research, it was found that bacterial cultures of Staphylococcus aureus showed a fairly high sensitivity to sextaphage, to which 83,3% (10 strains) of the total number of studied strains of this species were susceptible. Sensitivity to bacteriophages in Staphylococcus epidermidis strains was low. Bacterial strains of Streptococcus pyogenes showed greater susceptibility to streptococcal phage than to sextaphage. 87,5% of the strains were susceptible to streptococcal bacteriophage. Bacterial cultures of Streptococcus salivarius showed moderate susceptibility to bacteriophages.

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Horiuk, Yu V. "Lytic Activity of Staphylococcal Bacteriophage on Different Biotypes of Staphylococcus aureus". Scientific Messenger of LNU of Veterinary Medicine and Biotechnologies 21, n.º 94 (30 de julio de 2019): 115–20. http://dx.doi.org/10.32718/nvlvet9421.

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Bacteriophage is a virus that infects a bacterium by injecting a phage genome into a bacterial cytoplasm and uses a host cell as a propagation mechanism. The studied models of phages show a narrow range of hosts. Previous studies on the investigation of lytic activity of staphylococcal bacteriophages were focused on determining the sensitivity of S. aureus isolated from patients from different clinical material and clinically healthy people. However, there is no information as to how refractory are the already described agents against S. aureus ecovars, isolated from animals. The purpose of the work is to study the lytic activity of the agent “Staphylococcal Bacteriophage” in relation to different biotypes of Staphylococcus aureus. Microbiological treatment of samples for isolation of S. aureus was performed using BD Baird-Parker Agar according to standard techniques. To confirm the presence of S. aureus, tests were used for catalase, coagulase, oxidase, for D-mannitol fermentation, DNase production and acetoin. In cultures belonging to S. aureus, the biotype was determined using the scheme: determining the colour of pigment, the presence of beta hemolysis, the activity of coagulase in the bovine plasma, the formation of colonies in a medium with crystal violet. Determination of the range of action of bacteriophages in relation to clinical isolates of microorganisms was carried out by droplet method. The results of determining the lytic activity of staphylococcal bacteriophage in relation to S. aureus isolates of various biological origin showed that the lytic activity of staphylococcal bacteriophage is most active against S. aureus var. hominis. From the studied cultures S. aureus var. hominis full lysis in the course of dripping were found only in 4.8%, and in 42.8% of cultures showed a semiconfluent lysis. 14.3% of cultures S. aureus var. hominis were subjected to weak lytic activity of the bacteriophage. Also, there were detected 4,8% of cultures of this biotype, which were resistant to staphylococcal bacteriophage. In the study of lytic activity of staphylococcal bacteriophage up to 35 cultures S. aureus var. bovis, the manifestation of the lytic action of only one culture is established. Moreover, the level of lysis was estimated at “+/–”, that is, they showed less than 20 phage colonies. At the same time, the studied by us staphylococcal bacteriophage did not show the lytic action on S. aureus var. avium and S. aureus var. canis. Therefore, conducted studies have shown that the lytic activity of the agent “Staphylococcal Bacteriophage” is directed mainly to S. aureus var. hominis, and practically does not work on other biotypes. In consideration of the apparent lack of activity of phage agents in relation to the studied biotypes, attention should be focused on the specificity of phages, not only within the species of bacteria, but also within their biotypes.

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Vorobey, E. S., O. S. Voronkova y A. I. Vinnikov. "Correction of vaginal dysbiosis in mice caused by a film-forming strain Staphylococcus aureus, using bacteriophages and probiotics". Regulatory Mechanisms in Biosystems 8, n.º 2 (29 de abril de 2017): 252–58. http://dx.doi.org/10.15421/021739.

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The complex use of bacteriophages and probiotics is a promising trend in improving prevention and treatment of gynecological lesions. Our study of their influence on the microflora was performed on the model of vaginal dysbiosis of white laboratory mice induced by introduction of a filmforming strain of Staphylococcus aureus. For correction of dysbiosis, staphylococcal bacteriophage liquid, piobacteriophage polyvalent, intesti-bacteriophage liquid and probiotic "Vahilak" were used. For the identification of the microflora of the reproductive tract, samples of biological material from the vagina were obtained by sterile cotton swab and plated on nutrient media to determine the nature and extent of growth of the cultures. The maximal effect was found to occur with the correctional complex "bacteriophage staphylococcal liquid – vahilak" that led to decrease of total microbial number to 4.77 × 104 CFU/ml and to the restoration of the ratio of aerobic to anaerobic bacteria 1 : 52 when indicators of the norm were 4,69 × 104 CFU/ml and 1 : 52. In this case, 24 hours after the last injection of the preparations the amount of microaerophilic and anaerobic lactobacilli had increased by 20.8 and 2.1 times respectively. The frequency of isolation of microaerophilic lactobacilli increased to 100%, and anaerobic – up to 70%. Also the number of staphylococci, streptococci, enterococci, bacilli and enterobacteria decreased by 30.1, 1.1, 1.5, 2.2 and 11.8 times respectively. Also, there was a decrease in the detection rate of enterococci, micrococci and enterobacteria by 10% and bacilli by 20% compared to the control dysbiosis. The number of anaerobic bacteria also underwent significant changes. Thus, the number of fusobacteria decreased by 33.2 times, peptococci – 2.3, peptostreptococci – 6.6 and Bacteroides – 7.9 times, which is almost consistent with indicators of the norm. In addition, the frequency of detection of peptostreptococci decreased by 10%. Therefore, it can be concluded that medical bacteriophages are active against lesions caused by able to film-forming staphylococci, in vivo, so they are appropriate to use in medical practice both independently and in combination with other agents.

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Martykanova, Dilyara, Ilya Zemlenuhin, Ollga Reshetnik, Dilyara Kamaldinova y Nailya Davletova. "Sensitivity of staphylococcus microflora of wrestlers’ skin to bacteriophages". SCIENCE AND SPORT: current trends 7, n.º 3 (septiembre de 2019): 136–41. http://dx.doi.org/10.36028/2308-8826-2019-7-3-136-141.

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The purpose of this study was to identify the characteristics of bacteriocenosis of wrestlers’ skin and to determine the sensitivity of staphylococcal microflora to bacteriophages. Methods and organization of the research. The experiment involved 15 athletes aged 17-21 years engaged in national wrestling and belt wrestling. Qualifications ranged from 1st adult rank to the master of sports. We used the method of microbiological seeding on yolk-salt agar (JSA) to analyze the washes from the intact skin of the medial part of forearms of wrestlers before and immediately after training. We identified the grown colonies of microorganisms using MALDI Microflex Biotyper mass-spectrometer (Bruker, Germany). In addition to the total microbial abundance, the frequency of occurrence of hemolytic forms of bacteria on wrestlers’ skin was determined before and after training. We determined the sensitivity of Staphylococcus aureus bacteria to staphylococcal bacteriophage and polyvalent pyobacteriophage by the diameter of the bacteria lysis zone. Results and discussion. The research revealed the following facts. 1) S. aureus appears more often than other staphylococci on the skin of the medial part of wrestlers’ forearms both before and after training. 2) We detected high frequency of occurrence of hemolytic forms of Staphylococcus bacteria, which indicates the dysbiosis of wrestlers’ skin. 3) It is more efficient to use a staphylococcal bacteriophage than polyvalent pyobacteriophage for the prevention and treatment of infectious diseases of wrestlers’ skin caused by S. aureus. Conclusion. Athletes of contact sports demonstrate an increased risk of skin infectious diseases, and they need effective means of protection and prevention.

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Levanova, L. A., Yu V. Zakharova, A. A. Markovskaya y L. Yu Otdushkina. "Bacteriophage sensitivity of opportunistic microbiota in children with gut dysbiosis". Fundamental and Clinical Medicine 7, n.º 3 (30 de septiembre de 2022): 40–45. http://dx.doi.org/10.23946/2500-0764-2022-7-3-40-45.

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Aim. As the activity of bacteriophages is species- and strain-specific, it is necessary to study bacteriophage sensitivity in distinct geographic regions with various disease patterns. Here, we aimed to study the lytic activity of specific commercially available bacteriophages against Klebsiella spp., Proteus spp., and Staphylococcus aureus isolated from the intestines of children with gut dysbiosis.Materials and Methods. Bacteriophage sensitivity was assessed in 315 opportunistic microorganisms (125 Staphylococcus aureus strains, 120 Klebsiella spp. strains, 70 Proteus spp. strains) isolated from the intestinal microbiota of 300 children < 4 years of age with gut dysbiosis. Bacteriophage preparations were produced by Microgen (Russian Federation). The lytic activity of bacteriophages was studied by a drip method on a Muller-Hinton medium by calculating the area of bacterial culture lysis.Results. We found low sensitivity of Klebsiella spp. (37.5% sensitive strains) and Proteus spp. (41.4% sensitive strains) to specific bacteriophages, albeit there were considerable differences between distinct Klebsiella species (Klebsiella pneumoniae, 56.7% sensitive strains; Klebsiella oxytoca, 18.3% sensitive strains, p = 0.03) and Proteus species (Proteus vulgaris, 52.0% strains; Proteus mirabilis, 35.6% strains, p = 0.04). Nevertheless, sensitivity to Staphylococcus aureus was considerably higher (78.4%). In addition, lytic activity of bacteriophages reduced along with the increasing severity of gut dysbiosis.Conclusion. Klebsiella spp. and Proteus spp. isolated from children with dysbiosis have low sensitivity to commercially available bacteriophages. Bacteriophage sensitivity positively correlated with gut dysbiosis.

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Horiuk, Y., M. Kukhtyn, V. Horiuk, S. Kernychnyi y L. Tarasenko. "Characteristics of bacteriophages of the Staphylococcus aureus variant bovis". Veterinární Medicína 65, No. 10 (29 de octubre de 2020): 421–26. http://dx.doi.org/10.17221/55/2020-vetmed.

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Bacteriophages may be an alternative method of treatment for antibiotic-resistant bacteria, including mastitis in cows. Our study describes the initial isolation and bacteriological activity of bacteriophages, circulating on dairy farms, the against S. aureus var. bovis. Samples of cow’s milk secretions with signs of mastitis and sewage water were used as the study material. The isolation and production of pure bacteriophage lines were performed according to the double agar method. The method of studying a single cycle of phage reproduction was used to determine the duration of the latency period. Determination of the spectrum of the lytic activity of bacteriophages against the clinical isolates of the microorganisms was carried out by the drop method. As a result of the research, four phages, specific for S. aureus var. bovis were isolated: Phage SAvB07, Phage SAvB08, Phage SAvB12 and Phage SAvB14. The negative colonies of the isolated phages were 1–2 mm in size, rounded with clear edges, with varying degrees of transparency. The latency period of Phage SAvB14 was 35 min, with the number of active virions increasing by 8 orders. In the study on growth curves of other bacteriophages, taken in the experiment, the latency period was more than 35 min, and their titre increased by only two orders. Phage SAvB07, Phage SAvB08 and Phage SAvB12 were able to lyse the bacterial strains of S. aureus var. bovis in 25–45.6% of the cases (low lytic activity), whereas Phage SAvB14 lysed 94.1% of S. aureus strains were isolated from the cows. Studies have shown that among the bacteriophages we have studied, Phage SAvB14 with a short latency period has the best lytic action on the culture S. aureus var. bovis. The resulting bacteriophage strain can be used to create a bacteriophage-based drug for the treatment of mastitis in cows.

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Rybalkin, M. V., N. V. Khokhlenkova y К. Yе Nikiforova. "The study of the effectiveness of the antibacterial action of the combination of a bacteriophage with a probiotic". News of Pharmacy 103, n.º 1 (7 de febrero de 2022): 60–65. http://dx.doi.org/10.24959/nphj.22.83.

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Intestinal infections occupy one of the leading places in diseases of the gastrointestinal tract in humans and animals. Strains of Staphylococcus spp are one of the causative agents of an intestinal infection. When treating an intestinal infection caused by staphylococcus, antibiotics are most often used, but in recent years there has been the formation of resistance in staphylococcus strains to antibiotics that have been used for many years. One of the promising ways to solve the problem of antimicrobial resistance is the use of drugs based on bacteriophages, which have a specific effect on the disease pathogens, however, they are free of toxic and allergenic side effects on the human body and do not cause resistance. Aim. To study the antibacterial effect of the combination of a staphylococcal bacteriophage and a probiotic based on L. acidophilus lactobacilli to different staphylococcal strains. Materials and methods. The following bacterial strains were used in the study: St. aureus ATCC 25923 and St. epidermidis ATCC 12228. The “Polyphag Staf” staphylococcal bacteriophage (manufactured by NVK MVK, Ukraine) and the “Lactofor” probiotic (manufactured by Ananta Medicare Limited, India) based on L. acidophilus lactobacilli were selected as objects. In the study, the antibiotic “Erythromycin” in tablets of 100 mg (the manufacturer – Borschagovsky HFZ, Ukraine) was used as a reference drug. To detect the antibacterial activity to the experimental strains of St. aureus and St. epidermidis, the methods of Appelman and agar diffusion were used. Results and discussion. It was found that when using the combination of a staphylococcal bacteriophage and a probiotic with L. acidophilus lactobacilli the level of the antibacterial activity to the experimental strains of St. aureus and St. epidermidis was higher than when using only the bacteriophage. This is probably due to the synergism of the interaction of the components of the combination of active substances proposed. It was also found that the antibacterial activity of the combination of drugs and the antibiotic erythromycin proposed was at the same level. Thus, the combination of a bacteriophage that destroys staphylococcal bacteria, has no side effects, and does not cause resistance and a probiotics that improves the microflora of the gastrointestinal tract has a number of advantages over antibioticsin the treatment of intestinal infections caused by staphylococcal strains. Conclusions. The studies conducted indicate the prospects of using the combination of a staphylococcal bacteriophage and a probiotic based on L. acidophilus lactobacilli for the treatment of intestinal infections caused by different staphylococcal strains.

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Kuptsov, NS, MA Kornienko, RB Gorodnichev, DI Danilov, MV Malakhova, TV Parfenova, GI Makarenko, EA Shitikov y EN Ilina. "Efficacy of commercial bacteriophage products against ESKAPE pathogens". CIRCULATING RNA, n.º (3)2020 (25 de mayo de 2020): 18–24. http://dx.doi.org/10.24075/brsmu.2020.029.

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The ever-rising prevalence of multidrug-resistant bacteria necessitates the search for a therapeutic alternative to antibiotics. Using therapeutic products based on virulent bacteriophages might provide such an alternative. The aim of our study was to evaluate the efficacy of commercial phage products and natural bacteriophage monoisolates recovered from environmental sources against clinical strains of Enterococcus faecium, Staphylococcus aureus, Klebsiella pneumoniae, and Pseudomonas aeruginosa. We compiled a collection of 147 strains that were subsequently genotypes using the MLST method. The efficacy of bacteriophages was evaluated in spot tests. The highest efficacy was demonstrated by "Staphylococcal bacteriophage" (86%, effective against S. aureus), "Purified polyvalent pyobacteriophage" (87.8%, effective against K. pneumoniae), and a group of phage products against P. aeruginosa, including "Pseudomonas aeruginosa bacteriophage" (87.5%), "Complex pyobacteriophage" (79.5–90%) and "Purified polyvalent pyobacteriophage" (90–92.5%). The efficacy of "Intesti bacteriophage", which targets E. faecium, was 4.2%. The efficacy of commercial phage products against S. aureus and K. pneumoniae was higher than the efficacy of individual phage monoisolates (60% for the S. aureus phage vB_SauP-436-3w and 5.9% for the K. pneumoniae phage vB_Kp_M_ Seu621). Thus, all tested commercial phage products were highly effective against P. aeruginosa, K. pneumoniae and S. aureus. There are no commercial phage products on the market against other ESKAPE pathogens, including Acinetobacter baumannii and Enterobacter cloacae. Besides, there are no effective phage products against E. faecium. This dictates the need for new effective bacteriophages against these species.

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Aleksanina, N. V. y T. I. Tverdokhlebova. "Phage resistance of conditionally pathogenic intestinal microbiota bacteria in children with microbiocenosis disorders". Journal Infectology 13, n.º 2 (14 de julio de 2021): 102–7. http://dx.doi.org/10.22625/2072-6732-2021-13-2-102-107.

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Objective: to study the circulation and prevalence of phage-resistant strains among opportunistic enterobacteria, isolated from children with disorders of intestinal microflora, in relation to domestic preparations of bacteriophages.Materials and methods. A bacteriological study of the fecal microflora of the colon in 970 young children for dysbiosis was carried out. The sensitivity of 720 antibiotic-resistant strains of opportunistic enterobacteriaceae (S. aureus, K. pneumoniae, P. mirabilis and P. vulgaris, P. aeruginosa, E. coli, coagulase-negative staphylococci) isolated from children to domestic mono- and polyvalent drugs was studied (coliprotein, staphylococcal, Pseudomonas aeruginosa, purified Klebsiella pneumonia bacteriophage, “Sextafag”, Intesta bacteriophage). Determination of sensitivity to bacteriophages was carried out by the “sterile spot” method. Antibiotic sensitivity was determined by the disk diffusion method. Statistical processing of the results was carried out using the Microsoft Office Excel 2007 software package.Results. A large percentage of phage-resistant strains with low sensitivity to bacteriophages was revealed among opportunistic bacteria, amounting to 54,2%, with the highest circulation among coagulase-negative staphylococci, Proteus, Klebsiella (more than 50%). A significant spread of intestinal dysbiosis was established in young children (87,5%), characterized by a low content of bifidobacteria and a high level of allocation of opportunistic enterobacteria, including in associations.Conclusion. As a result of the studies, a significant prevalence of phage-resistant strains in children with dysbiosis was revealed, which indicates the need for preliminary determination of their sensitivity to bacteriophages in order to resolve the issue of their possible inclusion in the intestinal microflora correction system.

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Horiuk, Y. V., M. D. Kukhtyn, Y. S. Stravskyy, S. I. Klymnyuk, K. M. Vergeles y V. V. Horiuk. "Influence of staphylococcal Phage SAvB14 on biofilms, formed by Staphylococcus aureus variant bovis". Regulatory Mechanisms in Biosystems 10, n.º 3 (22 de agosto de 2019): 314–18. http://dx.doi.org/10.15421/021948.

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The use of bacteriophages for the treatment of chronic inflammatory processes has proved to be relevant, especially during isolation of antibiotic-resistant pathogens formed in biofilms. The article presents the results of research on the influence of Phage SAvB14 on young and mature biofilms formed by Staphylococcus aureus variant bovis. In the experiments we used cultures of S. aureus and a specific Phage SAvB14 isolated from the secretion of the mammary gland of cows suffering from chronic mastitis. In the study of the influence of bacteriophage on formed biofilms we determined the optical density of the dye solution that was washed from the biofilm photometrically on a spectrophotometer PE-5400UV (Ecroskhim, Russia) and the number of staphylococcal cells in the biofilm after the action of the bacteriophage on 24-hour and 72-hour biofilms by a ten-fold dilution on beef-extract agar. It was determined that under the influence of the bacteriophage on young 24-hour biofilms of S. aureus var. bovis, the optical density of the dye solution from biofilm increased within 4 hours up to 10% and the number of microbial cells increased by 1.8 times. After 32 hours of bacteriophage action, the optical density of the dye solution decreased on average by 34% compared to the initial density and the number of S. aureus cells in the biofilm decreased by 30 times. This indicates that microbial cells of young biofilms are not subject to complete lysis during the action of even this specific bacteriophage. Degradation of 77.5% of biofilm under the influence of the bacteriophage was observed on mature 72-hour biofilm within 32 hours at 37 °C. At the same time, viable cells of S. aureus were not isolated from the biofilm. This indicates the high lytic activity of the bacteriophage against mature biofilm bacteria and the possibility of its use in chronic staphylococcal infections caused by S. aureus var. bovis. Thus, the obtained data indicate that when mature 72-hour biofilms are exposed to the researched bacteriophage, their degradation is more intense compared with the young 24-hour biofilms, and the amount of destroyed biofilm was on average 2 times higher. This suggests that the use of specific staphylococcal Phage SAvB14 isolated by us for the destruction of biofilm, formed by S. aureus var. bovis, is promising.

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Tesis sobre el tema "Bacteriophage, Staphylococcic"

Messad, Nourreddine. "Staphylococcus aureus colonisant / Staphylococcus aureus infectant dans le modèle du pied diabétique". Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT063/document.

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Staphylococcus aureus est l’un des principaux agents étiologiques des infections suppuratives superficielles et profondes ainsi que des syndromes liés à l’action de toxines. Paradoxalement, cette bactérie est un agent commensal qui est présent sur la peau ainsi que dans les cavités nasales notamment. Cela permet de considérer cette bactérie comme un organisme colonisant commensale. Les bases génétiques expliquant la différence entre une bactérie pathogène et une bactérie commensale reste inconnues. En utilisant la technique Optical Maps sur des souches de S. aureus isolées de plaies de pieds diabétiques avec différents niveau de virulence, nous avons pu montrer l’existence d’un prophage insérés dans le génome des souches colonisantes et absent des souches infectantes. Le phage, nommé ROSA, est localisé dans un hotspot d’insertion de phage NM2. Il est aussi localisé en amont du locus isd qui est requis pour l’assimilation du fer essentiel à la bactérie dans sa phase pathogène. Le phage ROSA inactive la voie isd en dérégulant l’activité du régulateur transcriptionnel majeur Fur en absence de fer. Il réduit aussi la virulence de ces souches sur les 2 modèles de virulence (Le ver C. elegans et le Zebrafish). L’expulsion du phage ROSA restaure la régulation du locus isd par Fur et la production de sidérophores en absence de Fer, la formation du biofilm et la virulence des souches. La mutation du gène Fur nous a permis de déduire que le phage ROSA affectait les bactéries de manière indépendante de Fur. Enfin, nous avons étudié la prévalence des souches colonisantes sur les plaies de pieds diabétiques. Nous avons observé que 20% des souches présentait l’insertion ROSA et 89% appartenait au complexe clonal CC8. Les souches colonisantes, avec leur niveau bas de virulence, devraient faire l’objet de détection dans le but de rationnaliser l’utilisation des antibiotiques et ainsi lutter contre l’apparition de bactéries multirésistantes aux antibiotiques
Staphylococcus aureus is an opportunistic bacterium capable of causing a wide range of severe diseases when it gains access to underlying tissues. Paradoxically, this causative pathogen is a common inhabitant of the skin microflora and colonizes the nares and other human mucosa, and as such, may be considered as a commensal colonizing organism. The genetic basis for the differences in pathogenic/colonizing potential is unknown. By performing optical maps comparisons of a collection of S. aureus strains of defined virulence potential isolated from diabetic foot ulcers at different stages, we brought to light a prophage present in colonizing-causing bacteria. The phage, namely ROSA, was localized in a hotspot region NM2 near the locus isd, the main iron surface determinant that transport iron across the bacterial wall. It induces a deregulation of the activity of the transcriptional regulator Fur involving the biofilm formation of the bacteria in response to low iron environment. It reduced also significantly the virulence of the strain in two in vivo models (the nematode C. elegans and the zebrafish). The expulsion of the phage restored the regulation of the locus isd, the siderophore production, the biofilm formation and the virulence of the strain. The mutation of the fur gene within the colonizing strain enabled us to determine that the phage ROSA affect the the bacteria in a Fur-independent manner. Finally we determined the prevalence of these colonizing strains in skin and soft tissue infections (diabetic foot ulcers). We observed that 20% (39/195) of the strains harboured this insertion and 89% belonged to the clonal complex CC8. This colonizing strain by its low virulence potential must be detected in the aim to contribute to a sounder use of antibiotic treatment, an important point in front of the increase of multidrug resistant bacteria

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Montero, Diez Cristina. "Functional characterization of a bacteriophage-encoded inhibitor of Staphylococcus aureus transcription". Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:11068.

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Alves, Diana R. "Development and characterisation of a responsive polyvalent bacteriophage therapeutic". Thesis, University of Bath, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.675705.

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Bacteriophages (phages) are obligate intracellular parasites of bacteria that usually kill the bacterial host. Bacteriophage therapy is a recently revived approach for treating bacterial infection that relies on the traits of the phage lytic cycle. A lot of attention has been given to phage therapy with new research being published weekly and international conferences organised every year, bringing together the academic and industrial phage communities. However, despite this huge effort and considerable scientific interest there is still a great lack of understanding on how to use phage effectively and overcome the many obstacles in the near future. One of the main triggers for such interest was the increasing evidence of antibiotic resistance among human bacterial pathogens, which were once efficiently eliminated by drugs but are now causing alarmingly high levels of morbidity and mortality. Also, bacteria when causing a disease are able to produce highly protective biofilm communities. Biofilms are major causes of impairment of wound healing and two of the most common and aggressive wound pathogens are Staphylococcus aureus (Gram-positive) and Pseudomonas aeruginosa (Gram-negative), both displaying a large repertoire of virulence factors and reduced susceptibility to antibiotics. This work reports and explores the use of phages to target both S. aureus and P. aeruginosa pathogen biofilm producers. Firstly, isolation of promising phage candidates was performed and cocktails were established. Two phages (DRA88 and phage K) formed the cocktail to target S. aureus and six phages (DL52, DL54, DL60, DL62, DL64 and DL68) formed a cocktail to target P. aeruginosa. A thorough characterisation of each of the selected phages was performed, including their range of host infectivity and their genome sequences were analysed. The phage’s ability to infect and kill planktonic cultures was successfully studied and afterwards such ability was assayed on biofilms using an in vitro static biofilm system (microtitre-plate), followed by an in vitro dynamic biofilm system (The Modified Robbins Device). Both cocktails were shown to be effective in reducing and dispersing biofilms formed by the clinical strains showing them to be promising not only to combat topical bacterial infections (related to biofilm production), but also to control biofilms produced on the surfaces of medical devices, such as catheters. Finally, the phage cocktail’s ability to treat systemic infections caused by the two pathogens was assessed in an in vivo G. mellonella infection model. In the case of the P. aeruginosa infection, although the phages were not able to fully treat the larvae, the cocktail allowed a delay of larval death, caused by the infection. For the S. aureus infection, the cocktail did not show the same trend, but most likely the high bacterial cell numbers involved in the experiment interfered with a successful study on the phage cocktail. The phage mixture may form the basis of an effective treatment for infections caused by S. aureus and P. aeruginosa biofilms.

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Lane, Kristin. "Transcriptional crosstalk between helper bacteriophages and Staphylococcal aureus pathogenicity islands". VCU Scholars Compass, 2013. http://scholarscompass.vcu.edu/etd/3267.

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Acquisition of a superantigen pathogenicity island (SaPI) significantly increases virulence in Staphylococcus aureus. Horizontal transfer of SaPIs occurs at high frequency and depends upon a helper bacteriophage, either through direct infection or SOS-mediated induction of a lysogen. SaPIs hijack the packaging machinery of the helper phage, leading to the formation of SaPI-containing transducing particles that can introduce the pathogenicity island into neighboring SaPI-negative cells. All SaPIs contain a conserved core of genes, some of which are co-transcribed as an operon and encode functions involved in helper exploitation. The goal of this study was to more fully understand the intricate relationships between the SaPI elements and their helper bacteriophages, specifically any regulatory crosstalk that might occur between them. We demonstrated phage-host interactions in 80 and 80α, and SaPI1 and SaPIbov1-mediated crosstalk with helper phage 80α. The phage Sri protein was shown to be a bi-functional protein that both derepresses SaPI1 and interferes with host chromosome replication. Incoming SaPI1 experiments showed that SaPI1 modulates the levels of the N-terminal part of orf14 mRNA. Induction experiments using the 80α ΔrinA phage as a genetic tool, reveal several new phage genes that SaPI1 targets for expression modulation. Finally, a novel SaPI1 interference mechanism was identified. In an 80α ΔrinA mutant, which cannot activate its late operon, SaPI1 can directly turn on expression of the packaging and structural genes in a noncanonical manner, initiating from the 2nd gene in the operon, the large terminase subunit.

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Caufield, J. Harry. "N-TERMINAL PROCESSING OF RIBOSOMAL PROTEIN L27 IN STAPHYLOCOCCUS AUREUS". VCU Scholars Compass, 2012. http://scholarscompass.vcu.edu/etd/361.

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The bacterial ribosome is essential to cell growth yet little is known about how its proteins attain their mature structures. Recent studies indicate that certain Staphlyococcus aureus bacteriophage protein sequences contain specific sites that may be cleaved by a non-bacteriophage enzyme (Poliakov et al. 2008). The phage cleavage site was found to bear sequence similarity to the N-terminus of S. aureus ribosomal protein L27. Previous studies in E. coli (Wower et al.1998; Maguire et al. 2005) found that L27 is situated adjacent to the ribosomal peptidyl transferase site, where it likely aids in new peptide formation. The predicted S. aureus L27 protein contains an additional N-terminal sequence not observed within the N-terminus of the otherwise similar E. coli L27; this sequence appears to be cleaved, indicating yet-unobserved ribosomal protein post-translational processing and use of host processes by phage. Phylogenetic analysis shows that L27 processing has the potential to be highly conserved. Further study of this phenomenon may aid antibiotic development.

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Chang, Jenny Ren-Jye. "Scaffolding-mediated capsid size determination in bacteriophages". Birmingham, Ala. : University of Alabama at Birmingham, 2009. https://www.mhsl.uab.edu/dt/2009p/changj.pdf.

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Thesis (Ph. D.)--University of Alabama at Birmingham, 2009.
Title from PDF title page (viewed Jan. 26, 2010). Additional advisors: Asim K. Bej, Gail E. Christie, Peter E. Prevelige, Jr., R. Douglas Watson. Includes bibliographical references.

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Jensen, Kyle C. "Isolation and Host Range of Staphylococcus aureus Bacteriophages and Use for Decontamination of Fomites". BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/5508.

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Staphylococcus aureus is a common bacterium found on the skin and mucosal membranes of about 20% of the population. S. aureus growth on the skin is harmless, but if it bypasses the skin it can causes life-threatening diseases such as pneumonia, meningitis, bacteremia, and sepsis. Antibiotic-resistant strains of S. aureus, called Methicillin Resistant S. aureus (MRSA), are resistant to most antibiotics except vancomycin. However, vancomycin resistant strains of MRSA are becoming more common. In this study, 12 phages were isolated capable of infecting human S. aureus and/or MRSA strains. Five phages were discovered through mitomycin C induction of prophages and seven phages were found through enrichment of environmental samples. Primary S. aureus strains were also isolated from environmental sources to be used as tools for phage discovery and isolation as well as to examine the target cell host range of the phage isolates. S. aureus isolates were tested for susceptibility to oxacillin in order to determine methicillin-resistance. Experiments were performed to assess the host range and killing potential of newly discovered phage. The M1M4 phage had the broadest host range and lysed 12% of the S. aureus strains that were tested. The host ranges were reinforced by spectrophotometric assay data which showed a reduction in bacterial optical density of 1.3 OD600. The phages were used to decontaminate MRSA from fomites (glass and cloth) and successfully reduced colony forming units by 1-2 logs, including tests of a phage cocktail against a cocktail of MRSA isolates. Our findings suggest that phage treatment can be used as an effective tool to decontaminate human MRSA from both hard surfaces and fabrics.

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Birch-Machin, I. R. "Studies of typing bacteriophages 77, 52A and 47 of Staphylococcus aureus". Thesis, University of Sheffield, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.538935.

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Clem, Angela. "Bacteriophage for the elimination of methicillin-resistant staphylococcus aureus (MRSA) colonization and infection". [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001568.

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Luckmini, Kaushalya Weerakoon Jayaswal Radheshyam K. "Molecular analysis of the upstream region of a lysin gene (lytA) of bateriophage 011 of Staphylococcus aureus". Normal, Ill. Illinois State University, 1995. http://wwwlib.umi.com/cr/ilstu/fullcit?p9633406.

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Thesis (Ph. D.)--Illinois State University, 1995.
Title from title page screen, viewed May 12, 2006. Dissertation Committee: Radheshyam K. Jayaswal (chair), Brian J. Wilkinson, Alan J. Katz, Herman E. Brockman, Anthony J. Otsuka. Includes bibliographical references (leaves 112-118) and abstract. Also available in print.

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Más fuentes

Libros sobre el tema "Bacteriophage, Staphylococcic"

Bjerketorp, Joakim. Novel adhesive proteins of pathogenic Staphylococci and their interaction with host proteins. Uppsala: Swedish University of Agricultural Sciences, 2004.

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Capítulos de libros sobre el tema "Bacteriophage, Staphylococcic"

Olson, Michael E. "Bacteriophage Transduction in Staphylococcus aureus". En Methods in Molecular Biology, 69–74. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/7651_2014_186.

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Olson, Michael E. y Alexander R. Horswill. "Bacteriophage Transduction in Staphylococcus epidermidis". En Methods in Molecular Biology, 167–72. Totowa, NJ: Humana Press, 2013. http://dx.doi.org/10.1007/978-1-62703-736-5_15.

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Krausz, Kelsey L. y Jeffrey L. Bose. "Bacteriophage Transduction in Staphylococcus aureus: Broth-Based Method". En Methods in Molecular Biology, 63–68. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/7651_2014_185.

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Jassim, Sabah A. A. y Richard G. Limoges. "Control, Prevention and Rapid Detection of Methicillin-Resistant Staphylococcus aureus". En Bacteriophages: Practical Applications for Nature's Biocontrol, 113–63. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-54051-1_4.

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Vaks, Lilach y Itai Benhar. "Antibacterial Application of Engineered Bacteriophage Nanomedicines: Antibody-Targeted, Chloramphenicol Prodrug Loaded Bacteriophages for Inhibiting the Growth of Staphylococcus aureus Bacteria". En Methods in Molecular Biology, 187–206. Totowa, NJ: Humana Press, 2011. http://dx.doi.org/10.1007/978-1-61779-052-2_13.

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Ulrich Picoli, Simone, Nicole Mariele Santos Röhnelt y Tiago Sfredo Schenkel. "Bacteriophages as Anti-Methicillin Resistant Staphylococcus aureus Agents". En Staphylococcus aureus [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.98313.

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Staphylococcus aureus is a colonizing microorganism of the nasal region of both humans and animals and represents an important opportunistic pathogen. The acquisition of the mecA and mecC genes by S. aureus led to the emergence of methicillin resistance (MRSA), becoming a public health problem in both human and animal areas. In addition to resistance to β-lactam antibiotics, MRSA strains have multidrug resistance to antimicrobials, significantly limiting therapeutic options, making it crucial to have effective alternatives for treating staphylococcal infections. In this context, the use of lytic bacteriophages, which are viruses that infect and lyse bacteria, as well as the use of their by-products, such as endolysins, has shown potential in the control of S. aureus, including MRSA. Due to the specificity of bacteriophages to infect particular prokaryotic hosts, these viruses represent an antibacterial resource for the control of public health relevant microorganisms, especially antibiotic-resistant bacteria.

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Vinícius Pimentel Rodrigues, Igor, Katia Regina Assunção Borges, Maria do Desterro Soares Brandão Nascimento y Geusa Felipa de Barros Bezerra. "Bacteriophages: The Good Side of the Viruses". En Bacteriophages in Therapeutics. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96019.

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Bacteriophages or phages are bacterial viruses that are known to invade bacterial cells and, in the case of the lytic phages, impair bacterial metabolism, causing them to lyse. Since the discovery of these microorganisms by Felix d’Herelle, a French-Canadian microbiologist who worked at Institut Pasteur in Paris, Bacteriophages begin to be used in the treatment of human diseases, like dysentery and staphylococcal skin disease. However, due to the controversial efficacy of phage preparations, and with the advent of antibiotics, commercial production of therapeutic phage preparations ceased in most of the Western world. Nevertheless, phages continued to be used as therapeutic agents (together with or instead of antibiotics) in Eastern Europe and in the former Soviet Union. Therefore, there is a sufficient body of data that incite the accomplishment of further studies in the field of phage therapy.

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Barrera-Rivas, Claudia I., Norma A. Valle-Hurtado, Graciela M. González-Lugo, Víctor M. Baizabal-Aguirre, Alejandro Bravo-Patiño, Marcos Cajero-Juárez y Juan J. Valdez-Alarcón. "Bacteriophage Therapy: An Alternative for the Treatment of Staphylococcus aureus Infections in Animals and Animal Models". En Frontiers in Staphylococcus aureus. InTech, 2017. http://dx.doi.org/10.5772/65761.

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Actas de conferencias sobre el tema "Bacteriophage, Staphylococcic"

Letarova, M. A., I. V. Perminova y A. V. Letarov. "Effect of humic compounds on adsorption of virulent bacteriophages on host cells: case study for Escherichia coli and C600-9g, and Staphylococcus aureus A515 – bacteriophage phA515". En Fifth International Conference of CIS IHSS on Humic Innovative Technologies «Humic substances and living systems». CLUB PRINT ltd., 2019. http://dx.doi.org/10.36291/hit.2019.letarova.073.

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Elshayeb, Ayman Ahmed. "The Bacteriophage Efficiency and Antibiotics Susceptibility against Escherichia Coli and Staphylococcus Aureus". En Qatar Foundation Annual Research Conference Proceedings. Hamad bin Khalifa University Press (HBKU Press), 2016. http://dx.doi.org/10.5339/qfarc.2016.hbpp2246.

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Mueller, Meike, Heike Roehr, Dirk Mueller-Hagen, Norbert Krug, Armin Braun y Robert Mueller. "Newly Developed Staphylococcus Aureus (S. Aureus) Lung Infection Model For Testing Of Preclinical Efficacy Of Bacteriophages". En American Thoracic Society 2010 International Conference, May 14-19, 2010 • New Orleans. American Thoracic Society, 2010. http://dx.doi.org/10.1164/ajrccm-conference.2010.181.1_meetingabstracts.a4749.

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Cameron, D., J. Prazak, M. Iten, L. Valente, D. Grandgirard, S. L. Leib, S. M. Jakob, M. Haenggi y Y. A. Que. "Utility of Nebulized Bacteriophages for Prophylaxis of Experimental Ventilator Associated Pneumonia Due to Methicillin-Resistant Staphylococcus Aureus". En American Thoracic Society 2020 International Conference, May 15-20, 2020 - Philadelphia, PA. American Thoracic Society, 2020. http://dx.doi.org/10.1164/ajrccm-conference.2020.201.1_meetingabstracts.a2614.

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