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Further potential limitations of the undifferentiated faecal egg count reduction test for the detection of anthelmintic resistance in sheep

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Abstract:



Fifteen (36%) of 42 mixed gastro-intestinal nematode infections in sheep, identified as drench-susceptible by the undifferentiated faecal egg count reduction test, were found to harbour anthelmintic-resistant worms when analysed on the basis of changes in the egg counts of individual nematode genera. Most of these cases involved resistance in a single nematode genus, with Ostertagia and Trichostrongylus being implicated most frequently. The possible contributory role of larval culture results in helping to reduce the chances of the faecal egg count reduction test producing these and similar types of errors is discussed.

Keywords: Anthelmintic resistance; Diagnostic procedures; Gastrointestinal; Nematodes; Parasitology - internal; Sheep

Document Type: Short Communication

Publication date: December 1, 1997

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