Veterinary Record · 1994 · 22 citations · 0 references
Veterinary MedicineVeterinary EpidemiologyVeterinary ParasitologyDiagnostic ParasitologyParasitologyVeterinary Parasitic DiseasesAnthelmintic ResistanceAntiparasitic Drug ResistanceAntiparasitic ResistanceHelminth ControlNematode DiagnosisSheep ParasitologyAnthelmintic AgentsAnthelmintic Drug TherapyAnthelmintic ProphylaxisAnthelmintic Screening AssaysAnthelmintic TreatmentAntihelminthic Drug ResistanceFecal Egg Count Reduction TestNematode Resistance Screening
On five farms identified by in vitro tests to have benzimidazole resistance, and on one farm with apparent anthelmintic failure, faecal egg count reduction tests were performed using benzimidazoles, levamisole and ivermectin. With benzimidazoles efficacy was less than 70 per cent on all farms, confirming the validity of the in vitro tests to detect benzimidazole resistance. On two farms levamisole had an efficacy of less than 90 per cent but laboratory tests failed to demonstrate levamisole resistance. Ivermectin reduced egg counts by 100 per cent on all farms.