Managing anthelmintic resistance--parasite fitness, drug use strategy and the potential for reversion towards susceptibility.

Abstract excerpt

The rotation of different anthelmintic classes, on an approximately annual basis, has been widely promoted and adopted as a strategy to delay the development of anthelmintic resistance in nematode parasites. Part of the rationale for recommending this practice was the expectation that resistant genotype worms have a lower ecological fitness than susceptible worms, at least in the early stages of selection, and so...

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