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Occurrence of Levamisole-Resistant and Tetramisole-Resistant Gastrointestinal (Gi) Nematodes in Sheep

PRASLICKA J, PILKO P, VARADY M, CORBA J
Veterinarni Medicina 40, 1995, 45-48

Two experiments were carried out with sheep naturally infected with gastrointestinal nematodes to evaluate efficacy of anthelmintics using in vivo faecal egg count reduction (FECR) test. In experiment 1 with 28 ewes, the following efficacy of anthelmintics given at recommended dose rates was observed: albendazole 99.4%, ivermectin 99.3% and levamisole 81.8%. In experiment 2 with 18 ewes, tetramisole exhibited 71.3% efficacy. Suspected resistance to imidothiazole anthelmintics was confirmed by in vitro larval development test (LDT)-minimal inhibition concentration (MIC) values were estimated at 2.0 mu g/ml. Infective larvae L3 cultivated from eggs produced by the population of resistant helminths were identified as Ostertagia and Trichostrongylus spp


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