Canine external otitis in Campo Grande, Mato Grosso do Sul State, Brazil

Abstract

A microbiological study was performed with secretions from the auditory canal of canines treated in private clinics and the out-patients section of the Federal State University of Mato Grosso do Sul, in Campo Grande. Samples were collected from the auditory canal of 40 animals with clinical signs of external otitis and 20 animals without signs; in order to identify Malassezia pachydermatis, samples were collected from 40 canines with otitis and 40 without disease.  The identification of the genus Malassezia sp. showed that 12.5% of the samples were positive in healthy canines, while 22.5% of animals with otitis were positive. Bacterial isolation showed that 100% of canines with otitis were positive, while healthy animals showed a positivity of 90%.  The most frequent microorganism in samples from animals with otitis was Staphylococcus sp. and Gram negative bacilli. The index of antibacterial resistance was greater for penicillin G, while the most effective antibacterials were enroxoflacine, gentamicine and polymixine B.