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Myiasis is a pathological condition caused by larvae of dipterous in living tissues. The most harmful myiasis in dogs is caused by the larvae of the fly Cochliomyia hominivorax . At the Hospital de Clinicas Veterinarias [Veterinary Medical Teaching Hospital], da Universidade Federal do Rio Grande do Sul, Porto Alegre-RS (HCV/UFRGS), nitenpyram (Capstar  ) has been used as larvicide before cleaning the wounds, although such drug is indicated by the company only as pulicide for dogs and cats. The aim of this study was to evaluate the efficacy of nitenpyram against larvae of Cochliomyia hominivorax in dogs with myiasis treated at HCV/UFRGS. Nitenpyram, at the routine dosage indicated as a pulicide ( ranging from 1 to 3,56 mg/kg), was administered to 17 dogs , without employing other medical, cleaning or combined procedure. All the animals were examinated again within a period of 24 hours, and it was observed that all recovered larvae were dead and the wounds presented a great improvement in 16 cases (94,11%) . In only one dog that had received the dosage of 1 mg/kg, viable larvae could still be observed. No adverse reaction to the drug was clinically remarked. These results suggest that a single dose of nitenpyram , even at a minimal dosage of 1mg/kg , should be considered as a very efficacious larvicidal against larvae of Cochliomyia hominivorax .

Emprego do nitenpyram como larvicida em miíases caninas por Cochliomyia hominivorax