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Short Communication

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

Pages 244-246 | Accepted 30 Jul 1997, Published online: 22 Feb 2011
 

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.

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