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Articoli di riviste sul tema "Teladorsagia circumcincta"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 5 febbraio 2022

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1

Stear, Michael, David Piedrafita, Sarah Sloan, Dalal Alenizi, Callum Cairns e Caitlin Jenvey. "Teladorsagia circumcincta". WikiJournal of Science 2, n. 1 (2019): 4. http://dx.doi.org/10.15347/wjs/2019.004.

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2

Usai, F., R. Rinnovati, V. Trocchi e L. Stancampiano. "Lepus corsicanus gastro-intestinal helminths: first report". Helminthologia 49, n. 2 (1 giugno 2012): 71–77. http://dx.doi.org/10.2478/s11687-012-0015-0.

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AbstractItalian hare Lepus corsicanus De Winton, 1898, is a true species living in simpatry with Lepus europaeus in mainland Italy and with Oryctolagus cuniculus in Sicily, where L. europaeus is absent. Up to date, nobody has studied the helminths of this endemic Italian Mammal. Therefore, in order to describe Italian hare gastro-intestinal helminths, gastro-intestinal tract of 29 Italian hares, coming from mainland Italy (#14) and from Sicily (#15) were collected between 1997 and 2009. Twentyfive hares were positive for at least one parasite (86 %). Six parasite species were isolated, 2 cestodes (Cittotaenia pectinata, prevalence 3 %) and Paranoplocephala sp., 3 %) and 4 nematodes (Trichostrongylus retortaeformis, 86 %, Graphidium strigosum, 14 %, Trichuris sp., 10 % and Teladorsagia circumcincta, 7 %). Both Teladorsagia circumcincta circumcincta and Teladorsagia circumcincta trifurcata morphotypes were identified. Comparison with available data regarding L. europaeus and O. cuniculus in Italy is provided. Being not T. circumcincta and Paranoplocephala sp. typical parasites of leporids, a description of the observed specimens is given.

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3

Morales, G., e J. Cabaret. "Determinacion de las relaciones polimorficas entre Teladorsagia circumcincta (Stadelmann, 1894) y Teladorsagia trifurcata (Ransom, 1907) en condiciones experimentales". Memórias do Instituto Oswaldo Cruz 80, n. 1 (marzo 1985): 85–90. http://dx.doi.org/10.1590/s0074-02761985000100013.

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En el presente estudio se demostró que Teladorsagia circumcincta (Stadelmann, 1894) y T. trifurcata (Ransom, 1907), nemátodes Trichostrongylidae de la sub-família Ostertagiinae, parasitan un espectro de hospedadores similares. La ausencia de barreras reproductivas entre T. trifurcata y T. circumcincta, así como la estabilización rápida de las proporciones de las dos entidades en el seno de la población, evidencia que T. trifurcata es un morfo de T. circumcincta.

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4

STEAR, M. J., P. D. ECKERSALL, P. A. GRAHAM, Q. A. McKELLAR, S. MITCHELL e S. C. BISHOP. "Fructosamine concentration and resistance to natural, predominantly Teladorsagia circumcincta infection". Parasitology 123, n. 2 (31 luglio 2001): 211–18. http://dx.doi.org/10.1017/s0031182001008253.

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Fructosamine concentrations reflect protein status and because infection with Teladorsagia circumcincta can induce a relative protein deficiency, we examined the usefulness of fructosamine concentrations as markers of the intensity of infection in naturally infected lambs. Fructosamine concentration was a heritable trait and variation in fructosamine concerntrations was associated with differences in body weight, and a variety of parasitological variables; animals with increased fructosamine concentrations grew more quickly, had increased faecal egg counts in one of the three study years, had decreased pepsinogen concentrations and decreased IgA activity against 4th-stage larvae of T. circumcincta. Fructosamine concentrations were also associated with variation in the subsequent acquisition of nematodes and in the length of adult female T. circumcincta; lambs with increased fructosamine concentrations had fewer nematodes but the mean length of adult female T. circumcincta was longer. Therefore fructosamine concentrations are potentially useful indicators of the severity of nematode infection and may predict magnitude of subsequent infection.

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5

Umair, Saleh, Charlotte L. G. Bouchet, Qing Deng, Nikola Palevich e Heather V. Simpson. "Characterisation of a Teladorsagia circumcincta glutathione transferase". Molecular and Biochemical Parasitology 239 (settembre 2020): 111316. http://dx.doi.org/10.1016/j.molbiopara.2020.111316.

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6

Craig, B. H., J. G. Pilkington e J. M. Pemberton. "Sex ratio and morphological polymorphism in an isolated, endemic Teladorsagia circumcincta population". Journal of Helminthology 84, n. 2 (18 settembre 2009): 208–15. http://dx.doi.org/10.1017/s0022149x09990551.

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AbstractTeladorsagia circumcincta is a polygamous nematode that exhibits morphological polymorphism. Sex ratio is typically female biased and the male nematodes occur in association with the genetically similar, minor morphotypes Teladorsagia davtiani and Teladorsagia trifurcata. In experimental infections, sex ratio (proportion male) and the proportion of minor male morphs observed have been shown to be influenced by both host and nematode-related factors. As similar investigations from natural systems are rare, this study examined whether sex ratio and minor male morph frequency were associated with host age and sex and nematode infra-population size in the isolated Soay sheep population on St Kilda. Count data for Teladorsagia were analysed for sheep of all age classes and both sexes from the winters of three consecutive population crashes (1999, 2002 and 2005). Generally, the intensity of Teladorsagia nematodes increased with host age until the age of 2 years before decreasing. In 2005, abundance of nematodes was generally higher than in the previous crashes, nematode sex ratio was negatively associated with host age and tended to be negatively associated with nematode intensity. Within the male nematode subpopulation, T. circumcincta always predominated, followed by T. davtiani and then T. trifurcata, with little variation in the relative proportions between hosts. The presence of each minor morph was primarily associated with the intensity of male T. circumcincta and, in those hosts where all three male morphs were detected, intensity of each minor morph was most associated with intensity of Teladorsagia females. Therefore, in a year when the nematode was generally more abundant, sex ratio appeared to be influenced by both host and nematode-related factors, whereas in all years examined, the frequency of morphological polymorphism was primarily density dependent.

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7

STEAR, M. J., N. G. HENDERSON, A. KERR, Q. A. MCKELLAR, S. MITCHELL, C. SEELEY e S. C. BISHOP. "Eosinophilia as a marker of resistance to Teladorsagia circumcincta in Scottish Blackface lambs". Parasitology 124, n. 5 (maggio 2002): 553–60. http://dx.doi.org/10.1017/s0031182002001580.

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Faecal egg counts and peripheral blood eosinophil counts were taken from Scottish Blackface lambs following natural, predominantly Teladorsagia circumcincta infection. Peripheral eosinophil concentrations were higher in animals with lower egg counts but only in lambs that were at least 3 months of age. The reduced egg counts were due to reduced fecundity of T. circumcincta; there was no association with the number of adult T. circumcincta. Associations with the number of parasites from other species of gastrointestinal nematodes appeared to be neutral or favourable. Estimated heritabilities for eosinophil concentrations in 4- and 5-month-old lambs were 0·48±0·16 and 0·43±0·17, respectively. Therefore, under defined circumstances, eosinophil concentrations may be a useful indicator of resistance to predominantly T. circumcincta infection.

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8

Grillo, Victoria, Barbara H. Craig, Barbara Wimmer e John Stuart Gilleard. "Microsatellite genotyping supports the hypothesis that Teladorsagia davtiani and Teladorsagia trifurcata are morphotypes of Teladorsagia circumcincta". Molecular and Biochemical Parasitology 159, n. 1 (maggio 2008): 59–63. http://dx.doi.org/10.1016/j.molbiopara.2008.01.001.

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9

Umair, S., C. Ria, J. S. Knight, R. J. Bland e H. V. Simpson. "Sarcosine metabolism in Haemonchus contortus and Teladorsagia circumcincta". Experimental Parasitology 134, n. 1 (maggio 2013): 1–6. http://dx.doi.org/10.1016/j.exppara.2013.01.017.

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10

Umair, S., R. J. Bland e H. V. Simpson. "Lysine catabolism in Haemonchus contortus and Teladorsagia circumcincta". Experimental Parasitology 131, n. 1 (maggio 2012): 101–6. http://dx.doi.org/10.1016/j.exppara.2012.03.014.

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11

Sloan, Sarah, Caitlin Jenvey, Callum Cairns e Michael Stear. "Cathepsin F of Teladorsagia circumcincta is a recently evolved cysteine protease". Evolutionary Bioinformatics 16 (gennaio 2020): 117693432096252. http://dx.doi.org/10.1177/1176934320962521.

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Parasitic cysteine proteases are involved in parasite stage transition, invasion of host tissues, nutrient uptake, and immune evasion. The cysteine protease cathepsin F is the most abundant protein produced by fourth-stage larvae (L4) of the nematode Teladorsagia circumcincta, while its transcript is only detectable in L4 and adults. T. circumcincta cathepsin F is a recently evolved cysteine protease that does not fall clearly into either of the cathepsin L or F subfamilies. This protein exhibits characteristics of both cathepsins F and L, and its phylogenetic relationship to its closest homologs is distant, including proteins of closely related nematodes of the same subfamily.

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12

STRAIN, S. A. J., S. C. BISHOP, N. G. HENDERSON, A. KERR, Q. A. MCKELLAR, S. MITCHELL e M. J. STEAR. "The genetic control of IgA activity against Teladorsagia circumcincta and its association with parasite resistance in naturally infected sheep". Parasitology 124, n. 5 (maggio 2002): 545–52. http://dx.doi.org/10.1017/s0031182002001531.

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Previous studies in deliberately infected sheep have shown an association between IgA activity against 4th-stage larvae of Teladorsagia circumcincta and parasite growth, development and fecundity. The purpose of this research was to determine if these results could be confirmed in naturally infected sheep and to explore the hypothesis that plasma IgA activity could help to identify resistant lambs with shorter adult nematodes. Plasma IgA activity was skewed with most animals having relatively low levels of IgA activity. Plasma IgA activity was repeatable and highly heritable. Animals with increased IgA activity had lower egg counts and shorter adult female T. circumcincta. Therefore, under conditions of natural parasite challenge, plasma IgA activity may help to identify lambs resistant to T. circumcincta.

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13

Ellis, Samantha, Jacqueline B. Matthews, Darren J. Shaw, Steve Paterson, Hamish E. G. McWilliam, Neil F. Inglis e Alasdair J. Nisbet. "Ovine IgA-reactive proteins from Teladorsagia circumcincta infective larvae". International Journal for Parasitology 44, n. 10 (settembre 2014): 743–50. http://dx.doi.org/10.1016/j.ijpara.2014.05.007.

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14

Barrett, M., F. Jackson e J. F. Huntley. "Pathogenicity and immunogenicity of different isolates of Teladorsagia circumcincta". Veterinary Parasitology 76, n. 1-2 (marzo 1998): 95–104. http://dx.doi.org/10.1016/s0304-4017(97)00221-5.

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15

Greenhalgh, Christopher J., Alex Loukas e Susan E. Newton. "The organization of a galectin gene from Teladorsagia circumcincta". Molecular and Biochemical Parasitology 101, n. 1-2 (giugno 1999): 199–206. http://dx.doi.org/10.1016/s0166-6851(99)00075-4.

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16

Simpson, H. V., N. Muhamad, L. R. Walker, D. C. Simcock, S. Brown e K. C. Pedley. "Nitrogen excretion by the sheep abomasal parasite Teladorsagia circumcincta". Experimental Parasitology 123, n. 1 (settembre 2009): 17–23. http://dx.doi.org/10.1016/j.exppara.2009.05.003.

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17

Walker, L. R., D. C. Simcock, K. C. Pedley, H. V. Simpson e S. Brown. "The kinetics and regulation of phosphofructokinase from Teladorsagia circumcincta". Experimental Parasitology 130, n. 4 (aprile 2012): 348–53. http://dx.doi.org/10.1016/j.exppara.2012.02.011.

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18

Bye, Karstein. "Abomasal nematodes from three Norwegian wild reindeer populations". Canadian Journal of Zoology 65, n. 3 (1 marzo 1987): 677–80. http://dx.doi.org/10.1139/z87-105.

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Three separate populations of wild reindeer (Rangifer tarandus tarandus L.) in Norway were examined for the presence of abomasal nematodes. The following six species were recorded: Ostertagia grühneri, Skrjabinagia arctica, Trichostrongylus axei, Teladorsagia circumcincta, Teladorsagia davtiani, and Nematodirus tarandi. Ostertagia grühneri dominated both in prevalence and intensity of infection. Teladorsagia davtiani occurred in only one of the populations investigated, and N. tarandi was found in calves only. Reindeer and sheep grazed the same areas, but no evidence of transfer of parasites from sheep to reindeer was found. All 72 adult reindeer and 10 calves examined during February–April harboured adult abomasal nematodes. The mean intensity of abomasal nematodes was highest in the population with the highest density of reindeer. Reindeer from this population were in poor physical condition. The influence of abomasal nematodes on life-history parameters of the host population is discussed.

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19

CRAIG, B. H., L. J. TEMPEST, J. G. PILKINGTON e J. M. PEMBERTON. "Metazoan-protozoan parasite co-infections and host body weight in St Kilda Soay sheep". Parasitology 135, n. 4 (24 gennaio 2008): 433–41. http://dx.doi.org/10.1017/s0031182008004137.

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SUMMARYFor hundreds of years, the unmanaged Soay sheep population on St Kilda has survived despite enduring presumably deleterious co-infections of helminth, protozoan and arthropod parasites and intermittent periods of starvation. Important parasite taxa in young Soay sheep are strongyles (Trichostrongylus axei, Trichostrongylus vitrinus and Teladorsagia circumcincta), coccidia (11 Eimeria species) and keds (Melophagus ovinus) and in older animals, Teladorsagia circumcincta. In this research, associations between the intensity of different parasite taxa were investigated. Secondly, the intensities of different parasite taxa were tested for associations with variation in host weight, which is itself a determinant of over-winter survival in the host population. In lambs, the intensity of strongyle eggs was positively correlated with that of Nematodirus spp. eggs, while in yearlings and adults strongyle eggs and coccidia oocysts were positively correlated. In lambs and yearlings, of the parasite taxa tested, only strongyle eggs were significantly and negatively associated with host weight. However, in adult hosts, strongyles and coccidia were independently and negatively associated with host weight. These results are consistent with the idea that strongyles and coccidia are exerting independent selection on Soay sheep.

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20

Elseadawy, Rana, Ibrahim Abbas, Moustafa Al-Araby, Michael B. Hildreth e Salah Abu-Elwafa. "First Evidence of Teladorsagia circumcincta Infection in Sheep from Egypt". Journal of Parasitology 105, n. 4 (3 luglio 2019): 484. http://dx.doi.org/10.1645/18-202.

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21

Bartley, D. J., L. Devin, M. Nath e A. A. Morrison. "Selection and characterisation of monepantel resistance in Teladorsagia circumcincta isolates". International Journal for Parasitology: Drugs and Drug Resistance 5, n. 2 (agosto 2015): 69–76. http://dx.doi.org/10.1016/j.ijpddr.2015.05.001.

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22

Wilson, D., e N. Sargison. "Anthelmintic resistance in Teladorsagia circumcincta in sheep in the UK". Veterinary Record 161, n. 15 (13 ottobre 2007): 535–36. http://dx.doi.org/10.1136/vr.161.15.535-a.

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23

Henderson, N. G., e M. J. Stear. "Eosinophil and IgA responses in sheep infected with Teladorsagia circumcincta". Veterinary Immunology and Immunopathology 112, n. 1-2 (luglio 2006): 62–66. http://dx.doi.org/10.1016/j.vetimm.2006.03.012.

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24

MARTÍNEZ-VALLADARES, M., R. GODIO-FERNÁNDEZ, M. P. VARA-DEL RÍO, J. F. MARTÍN e F. A. ROJO-VÁZQUEZ. "Expression of the recombinant protein disulphide isomerase of Teladorsagia circumcincta". Parasite Immunology 29, n. 1 (gennaio 2007): 47–56. http://dx.doi.org/10.1111/j.1365-3024.2006.00922.x.

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25

Umair, S., J. S. Knight, M. L. Patchett, R. J. Bland e H. V. Simpson. "Molecular and biochemical characterisation of a Teladorsagia circumcincta glutamate dehydrogenase". Experimental Parasitology 129, n. 3 (novembre 2011): 240–46. http://dx.doi.org/10.1016/j.exppara.2011.08.007.

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26

Martínez-Valladares, M., M. R. Famularo, N. Fernández-Pato, C. Cordero-Pérez, L. Castañón-Ordóñez e F. A. Rojo-Vázquez. "Characterization of a multidrug resistant Teladorsagia circumcincta isolate from Spain". Parasitology Research 110, n. 5 (17 dicembre 2011): 2083–87. http://dx.doi.org/10.1007/s00436-011-2753-1.

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27

Donaldson, J., M. F. J. van Houtert e A. R. Sykes. "The effect of nutrition on the periparturient parasite status of mature ewes". Animal Science 67, n. 3 (dicembre 1998): 523–33. http://dx.doi.org/10.1017/s1357729800032951.

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AbstractThe rôle of nutrition in the periparturient breakdown of resistance to gastrointestinal parasitism in mature ewes was investigated. Host resistance around this period, as measured by faecal egg concentration and worm burden, was sensitive to protein supply and to a lesser extent energy supply and body condition. Resistance was significantly less in ewes bearing and suckling twin lambs than those with singles. Differences in larval intakes spanning the range likely to be experienced in practice did not appear to be important. In dual infection with Teladorsagia circumcincta and Trichostrongylus colubriformis, the breakdown of resistance occurred almost exclusively with T. circumcincta confirming previous evidence of parasite species specificity in the periparturient breakdown of resistance.

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28

Young, C. J., J. B. McKeand e D. P. Knox. "Proteinases released in vitro by the parasitic stages of Teladorsagia circumcincta, an ovine abomasal nematode". Parasitology 110, n. 4 (maggio 1995): 465–71. http://dx.doi.org/10.1017/s0031182000064805.

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SUMMARYProteinases released during in vitro maintenance of third (L3) and fourth larval stage (L4) and adult Teladorsagia circumcincta (formerly Ostertagia circumcincta), an ovine abomasal nematode parasite, were characterized on the basis of pH optima, molecular size and specific proteinase inhibitor sensitivity. Enzyme activity was maximal at alkaline pH and stage-specific release was demonstrated. Proteinases released by the adult parasite degraded a variety of protein substrates including plasminogen, albumin and haemoglobin, in a pH-dependent manner. At alkaline pH fibrinogen degradation was restricted to the α and β peptide chains although the γ peptide chain was also degraded at acidic pH. Inhibitor sensitivity studies indicated that degradation was predominantly due to metalloproteinases although aspartyl proteinase activity was indicated at acidic pH.

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Kuznetsov, Seryodkin e Maksimova. "GASTROINTESTINAL NEMATODES OF DOMESTIC RUMINANTS IN PRIMORSKY KRAI". THEORY AND PRACTICE OF PARASITIC DISEASE CONTROL, n. 21 (29 maggio 2020): 169–72. http://dx.doi.org/10.31016/978-5-9902341-5-4.2020.21.169-172.

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The species composition of nematodes found during necropsies of cattle and small cattle in Primorsky Krai (Russian Far East) was determined. Mecistocirrus digitatus, Bunostomum phlebotomum, Cooperia punctata and Ostertgia ostertagi were found in cattle. Trichostrongylus colubriformis was registered in sheep and Teladorsagia circumcincta was found in goats. Small cattle had low rates of intensity and extensity of invasion, apparently, because of antiparasitic treatment performed by animal owners. The intensity of invasion in cattle reached 827 specimens. All nematode species found in this study were previously registered in Primorsky Krai. However, helminthological studies of goats in Primorsky Krai have been conducted for the first time. Thus, the registration of T. circumcincta is the first detection of this parasite in goats in Primorsky Krai. Since two of the detected nematodes (T. colubriformis and T. circumcincta) were repeatedly recorded in humans in several countries, these species deserve a special attention as potential causative agents of zoonosis.

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Umair, Saleh, Charlotte Bouchet, Nikola Palevich e Heather Simpson. "Teladorsagia circumcincta 1,6-Bisphosphate Aldolase: Molecular and Biochemical Characterisation, Structure Analysis and Recognition by Immune Hosts". Parasitologia 1, n. 1 (30 gennaio 2021): 1–11. http://dx.doi.org/10.3390/parasitologia1010001.

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A 1095 bp full length cDNA encoding Teladorsagia circumcincta aldolase (TciALDO-1) was cloned and expressed in Escherichia coli. Recombinant TciALDO-1 was purified, and its kinetic properties determined. The predicted protein consisted of 365 amino acids, and was present as a single band of about 44 kDa on SDS-PAGE. Multiple alignments of the protein sequence of TciALDO-1 with homologues from other helminths showed the greatest similarity (93%) to the aldolases of Haemonchus contortus and Dictyocaulus viviparus, 82–86% similarity to the other nematode sequences, and 68–71% similarity to cestode and trematode enzymes. Substrate binding sites and conserved regions were identified, and were completely conserved in other homologues. At 30 °C, the optimum pH for TciALDO-1 activity was pH 7.5, the Vmax was 432 ± 23 nmol × min−1 × mg−1 protein, and the apparent Km for the substrate fructose 1,6-bisphosphate was 0.24 ± 0.01 µM (mean ± SEM, n = 3). Recombinant TciALDO-1 was recognized by antibodies in both serum and saliva from field-immune sheep in ELISA, however, that was not the case with nematode-naïve sheep. Teladorsagia circumcincta fructose 1,6-bisphosphate aldolase appears to have potential as a vaccine candidate to control this common sheep parasite.

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PEMBERTON, ALAN D., JEREMY K. BROWN, NICKY M. CRAIG, JUDITH PATE, KEVIN McLEAN, NEIL F. INGLIS, DAVID KNOX e PAMELA A. KNIGHT. "Changes in protein expression in the sheep abomasum following trickle infection with Teladorsagia circumcincta". Parasitology 139, n. 3 (11 novembre 2011): 375–85. http://dx.doi.org/10.1017/s0031182011001983.

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SUMMARYContinual low-level exposure of sheep to the helminth Teladorsagia circumcincta elicits a temporary protective immunity, where factors in the immune abomasal mucosa prevent penetration of infective larvae, but which is essentially lost within 6 weeks of cessation of parasite challenge. Here, a proteomic approach was used to identify proteins that are differentially regulated in immune compared to naïve sheep, as potential key mediators of immunity. Six naïve sheep and 12 sheep trickle-infected with T. circumcincta were treated with anthelmintic, and the naïve (control) and 6 immune sheep were killed 7 days later. The remaining 6 sheep (immune waning) were killed 42 days after anthelmintic treatment. Abomasal tissue samples were subjected to 2D-gel electrophoresis and densitometric analysis. Selected spots (n=73) were identified by peptide mass fingerprinting and confirmatory Western blotting was carried out for 10 proteins. Spots selectively up-regulated in immune versus control, but not immune waning versus control sheep, included galectin-15 and thioredoxin, which were confirmed by Western blotting. In immune sheep, serum albumin was significantly down-regulated and albumin proteolytic cleavage fragments were increased compared to controls. Unexpectedly, albumin mRNA was relatively highly expressed in control mucosa, down-regulated in immune, and was immunolocalized to mucus-producing epithelial cells. Thus we have identified differential expression of a number of proteins following T. circumcincta trickle infection that may play a role in host protection and inhibition of parasite establishment.

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Walker, Lisa R., David C. Simcock, Jennifer D. Neale, Heather V. Simpson e Simon Brown. "Thermotolerance of L3 Ostertagia (Teladorsagia) circumcincta and some of its enzymes". Veterinary Parasitology 146, n. 1-2 (maggio 2007): 77–82. http://dx.doi.org/10.1016/j.vetpar.2007.02.009.

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Iposu, S. O., R. W. McAnulty, A. W. Greer, H. L. Xie, R. S. Green, M. Stankiewicz e A. R. Sykes. "Does suckling offer protection to the lamb against Teladorsagia circumcincta infection?" Veterinary Parasitology 153, n. 3-4 (maggio 2008): 294–301. http://dx.doi.org/10.1016/j.vetpar.2008.01.034.

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34

Scott, I., W. E. Pomroy, P. R. Kenyon, G. Smith, B. Adlington e A. Moss. "Lack of efficacy of monepantel against Teladorsagia circumcincta and Trichostrongylus colubriformis". Veterinary Parasitology 198, n. 1-2 (novembre 2013): 166–71. http://dx.doi.org/10.1016/j.vetpar.2013.07.037.

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35

French, Anne T., Pamela A. Knight, W. David Smith, Jeremy K. Brown, Nicola M. Craig, Judith A. Pate, Hugh R. P. Miller e Alan D. Pemberton. "Up-regulation of intelectin in sheep after infection with Teladorsagia circumcincta". International Journal for Parasitology 38, n. 3-4 (marzo 2008): 467–75. http://dx.doi.org/10.1016/j.ijpara.2007.08.015.

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36

Sutherland, I. A., A. E. Brown, D. M. Leathwick e S. A. Bisset. "Resistance to prophylactic treatment with macrocyclic lactone anthelmintics in Teladorsagia circumcincta". Veterinary Parasitology 115, n. 4 (agosto 2003): 301–9. http://dx.doi.org/10.1016/s0304-4017(03)00186-9.

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37

Umair, Saleh, Charlotte Bouchet, Nikola Palevich e Heather V. Simpson. "Characterisation and structural analysis of glyoxylate cycle enzymes of Teladorsagia circumcincta". Molecular and Biochemical Parasitology 240 (novembre 2020): 111335. http://dx.doi.org/10.1016/j.molbiopara.2020.111335.

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38

Stear, M. J., e S. C. Bishop. "The curvilinear relationship between worm length and fecundity of Teladorsagia circumcincta". International Journal for Parasitology 29, n. 5 (maggio 1999): 777–80. http://dx.doi.org/10.1016/s0020-7519(99)00019-3.

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39

Muhamad, Noorzaid, Lisa R. Walker, Kevin C. Pedley, David C. Simcock e Simon Brown. "The initial kinetics of NH3/NH4+ efflux from L3 Teladorsagia circumcincta". Parasitology International 61, n. 3 (settembre 2012): 487–92. http://dx.doi.org/10.1016/j.parint.2012.04.003.

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40

Jackson, F., E. Jackson, R. L. Coop e J. Huntley. "Interactions between Teladorsagia circumcincta and Trichostrongylus vitrinus infections in young lambs". Research in Veterinary Science 53, n. 3 (novembre 1992): 363–70. http://dx.doi.org/10.1016/0034-5288(92)90141-n.

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41

Gasnier, N., J. Cabaret e C. Moulia. "Allozyme variation between laboratory reared and wild populations of Teladorsagia circumcincta". International Journal for Parasitology 22, n. 5 (agosto 1992): 581–87. http://dx.doi.org/10.1016/0020-7519(92)90005-6.

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42

Simcock, D. C., S. Brown, J. D. Neale, S. M. C. Przemeck e H. V. Simpson. "L3 and adult Ostertagia (Teladorsagia) circumcincta exhibit cyanide sensitive oxygen uptake". Experimental Parasitology 112, n. 1 (gennaio 2006): 1–7. http://dx.doi.org/10.1016/j.exppara.2005.08.005.

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43

Venturina, Virginia M., Anton G. Gossner e John Hopkins. "The immunology and genetics of resistance of sheep to Teladorsagia circumcincta". Veterinary Research Communications 37, n. 2 (22 febbraio 2013): 171–81. http://dx.doi.org/10.1007/s11259-013-9559-9.

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44

Richard, S., e J. Cabaret. "Primary infection of kids with Teladorsagia circumcincta: susceptibility and blood constituents". Veterinary Parasitology 47, n. 3-4 (maggio 1993): 279–87. http://dx.doi.org/10.1016/0304-4017(93)90029-m.

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45

THEODORIDIS (Ι. ΘΕΟΔΩΡΙΔΗΣ), Y., C. HIMONAS (Χ. ΧΕΙΜΩΝΑΣ) e M. PAPAZAHARIADOU (Μ. ΠΑΠΑΖΑΧΑΡΙΑΔΟΥ). "Helminths parasites of digestive trackt of sheep and goats in Macedonian region". Journal of the Hellenic Veterinary Medical Society 51, n. 3 (31 gennaio 2018): 195. http://dx.doi.org/10.12681/jhvms.15674.

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Abstract (sommario):

During two periods (December 1985-October 1986 and October 1990-April 1991), the digestive tracts of 102 sheep and 29 goats were examined, with the purpose to find out and identify the helminthes parasites of these animals. The 96,1% of sheep and 93,1% of goats were found to be infected with 26 and 20 different helminths, respectively. The nematodes which were found out of the different parts of the digestive tract of these animals were: Sheep: oesophagus: Gongylonema pulchrum, abomasum: Haemonchus contortus, Teladorsagia circumcincta, T. trifurcata, Trichostrongylus axei and Cooperia oncophora, small intestine: Teladorsagia circumcincta, Trichostrongylus colubriformis} T. vitrinus, T. capricola, Cooperia oncophora, C. curticei, Nematodirus filicollis, N. helvetianus, N. spathiger, N. battus, Bunostomum trigonocephalum and Strongyloides papillosus, large intestine: Oesophagostomum venulosum, Oe. columbianum, Chabertia ovina, Trichuris globulosa, T. ovis and Skrjabinema ovis. Goats: all the previous findings except T. vitrinus, Nematodirus helvetianus, N. battus and Trichuris ovis. The cestodes parasites, Moniezia expansa, Moniezia benedni, Avitellina centripunctata and Stilesia globipunctata were found into the small intestine of sheep and, Moniezia expansa and Avitellina centripunctata, in goats only. All animals were infected with more than one different parasites. The sheep nematodes Cooperia curticei, Nematodirus helvetianus, and N. spathiger, were identified for the first time in Greece, more over, Nematodirus battus were found out and identified for the first time in Greece.

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46

Jackson, F., E. Jackson e R. L. Coop. "Evidence of multiple anthelmintic resistance in a strain of Teladorsagia circumcincta (Ostertagia circumcincta) isolated from goats in Scotland". Research in Veterinary Science 53, n. 3 (novembre 1992): 371–74. http://dx.doi.org/10.1016/0034-5288(92)90142-o.

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47

Stear, M. J., S. C. Bishop, N. G. Henderson e I. Scott. "A key mechanism of pathogenesis in sheep infected with the nematode Teladorsagia circumcincta". Animal Health Research Reviews 4, n. 1 (giugno 2003): 45–52. http://dx.doi.org/10.1079/ahrr200351.

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Abstract (sommario):

AbstractInfection of sheep with the abomasal nematode Teladorsagia circumcincta can cause a relative protein deficiency and reduce growth rate in growing lambs. A key event appears to be the destruction of junctions between epithelial cells. If the infection is heavy or prolonged, this leads to increased mucus production, hyperplasia, decreased acid production, gastrinemia, inappetance and pepsinogenemia. The severity of the infection depends upon the extent of concurrent infection, the nutritional status of the host and genetically controlled variation in the ability to mount protective immune responses.

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48

Andrews, R. H., e I. Beveridge. "Apparent absence of genetic differences among species of Teladorsagia (Nematoda: Trichostrongylidae)". Journal of Helminthology 64, n. 4 (dicembre 1990): 290–94. http://dx.doi.org/10.1017/s0022149x00012311.

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Abstract (sommario):

ABSTRACTThe technique of allozyme electrophoresis was applied to three species of Teladorsagia present in sheep to determine the extent of genetic variation among species. Thirty-four enzyme loci were established of which 22 were invariant and 12 were shown to be polymorphic. No fixed allelic differences were detected among the species and the level of polymorphism was within the range found commonly between populations of a single species. Therefore, the genetic data support breeding data and existing morphological evidence that T. circumcincta, T. davtiani and T. trifurcata as currently recognized do in fact belong to a single species.

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49

Le Jambre, L. F., P. J. Martin e A. Johnston. "Efficacy of combination anthelmintics against multiple resistant strains of sheep nematodes". Animal Production Science 50, n. 10 (2010): 946. http://dx.doi.org/10.1071/an09152.

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Abstract (sommario):

Broad-spectrum anthelmintics were tested for their efficacy in either single active or combination formulations against multiple anthelmintic-resistant strains of Haemonchus contortus, Teladorsagia circumcincta and Trichostrongylus colubriformis. Three efficacy trials based on post mortem worm counts showed that the triple and quadruple combinations of benzimidazoles, levamisole, macrocyclic lactones and closantel were effective against most strains that were resistant to each of the components when drenched individually. Consequently, use of any one of these classes of anthelmintics by itself against multiple-resistant strains would lead to a rapid increase in the level of resistance. When used in combinations, the anthelmintics reduced the survival rate of most strains to <5%. However, because some strains of T. circumcincta and T. colubriformis were found to be resistant to all combinations currently marketed in Australia, it is clear that combinations should be used before resistance levels become too high.

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50

Donaldson, J., M. F. J. van Houtert e A. R. Sykes. "The effect of dietary fish-meal supplementation on parasite burdens of periparturient sheep". Animal Science 72, n. 1 (febbraio 2001): 149–58. http://dx.doi.org/10.1017/s1357729800055648.

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Abstract (sommario):

AbstractPregnant ewes were offered 0·80, 1·0 or 1·25 of estimated protein requirement, groups P80, P100 and P125, respectively and trickle infected with Teladorsagia circumcincta (average of 10000 larvae per day) and Trichostrongylus colubriformis (average of 7000 larvae per day) for 42 days prior to parturition. Eleven days after lambing half (group TC) received a single challenge infection of 25000 T. circumcincta and 17500 T. colubriformis larvae and the remainder (TO) no further larval challenge. Worm burdens were determined 21 days post partum.Worm burdens were inversely related to dietary protein concentration. Mature worms (L5) of T. circumcincta recovered were (log10 (count + 1)) 4·002, 3·806 and 3·444 in TO sheep and 3·812, 3·633 and 3·113 in TC sheep from P80, P100 and P125 groups, respectively. The corresponding burdens of T. colubriformis were 2·665, 2·893 and 2·029 for TO and 3·985, 2·363 and 1·188 for TC sheep. The numbers of L4 larvae recovered from TC sheep were (log10 (count + 1)) 3·532, 3·288 and 3·127 for T. circumcincta and 3·080, 2·180 and 0·949 for T. colubriformis on P80, P100 and P125 diets, respectively. There was no evidence of inhibition of larval development or egg laying with either worm species suggesting that the major effect of protein supply in enhancing resistance was operating at the larval establishment stage. There was evidence that the post-partum challenge infection affected the fecundity and survival of the established adult worm population of T. circumcincta but not of T. colubriformis.

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