Safety and efficacy of ivermectin against ear mites (Otodectes cynotis) in ranch foxes

William J. Foreyt From the Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA 99164.

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Summary

Efficacy of ivermectin at a dosage of 0.2 mg/kg of body weight was evaluated against naturally acquired ear mite (Otodectes cynotis) infestation in commercially raised ranch foxes (Vulpes fulva). Efficacy of ivermectin given sc twice at 3-week intervals was 97.4%. Toxicosis associated with drug treatment was not observed. Increased dosage of 1.0 mg/kg was given sc to 5 foxes each week for 6 consecutive weeks, and signs of toxicosis or illness were not observed after treatment.

Summary

Efficacy of ivermectin at a dosage of 0.2 mg/kg of body weight was evaluated against naturally acquired ear mite (Otodectes cynotis) infestation in commercially raised ranch foxes (Vulpes fulva). Efficacy of ivermectin given sc twice at 3-week intervals was 97.4%. Toxicosis associated with drug treatment was not observed. Increased dosage of 1.0 mg/kg was given sc to 5 foxes each week for 6 consecutive weeks, and signs of toxicosis or illness were not observed after treatment.

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