During the period from May to September 1996, attempts were made to isolate bacteria from 92 dogs diagnosed as otitis externa at the animal hospital and the minimum inhibitory concentration (MIC) of antifungal and antibacterial agents against these isolates were determined.
Malassezia pachydermatis was isolated from the external acoustic meatus lesions at a rate 70% (60 strains). In the sensitivity tests to nine antifungal agents, ketoconazol gave the lowest MICs to these isolates, followed by miconazol nitrate and amphotericin B, but the isolates were resistant to other agents. Among 126 bacterial strains isolated from the external acoustic meatus lesions, the most predominant species were
Staphylococcus spp., followed by
Pseudomonas spp.,
Corynebacterium spp. and
Streptococcus canis in this order. In the sensitivity tests of these isolates using 11 kinds of antibacterial agents, multiple drug resistance was found in many of such glucose nonfermenting organisms as
Pseudomonas spp. and
Streptococcus canis, and many of the isolates were sensitive to orbifloxacin only. In the present study,
Malassezia pachydermatis and bacteria were isolated from many dogs suffering from otitis externa and many of the isolates were resistant to multiple drugs.
View full abstract
