Sensitivity of field isolates of Eimeria acervulina to salinomycin, maduramicin, and a mixture of clopidol and methyl benzoquate in the chicken.

Lerbek was more effective than salinomycin, and salinomycin more effective than maduramicin, against field isolates of E. acervulina obtained from farms where salinomycin had been used continuously for 30 crops. Salinomycin was the most effective drug against isolates of E. acervulina from farms where various shuttle programmes had been employed. Lerbek and maduramicin were ineffective against these isolates.

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