Antibiotic Susceptibility Patterns of Pseudomonas aeruginosa Strains Isolated from Dogs with Otitis Externa

The aims of this study were to isolate Pseudomonas aeruginosa from dogs with otitis externa (OE), to determine the susceptibility of isolated strains to antibiotics, and to evaluate the incidence of the infection in the Ayd›n region. For this purpose, ear swab samples were obtained from 92 dogs with symptoms of OE infection and the samples were examined bacteriologically. Bacteria were isolated from 88 (96%) of 92 samples but no isolation was performed on 4 (4%) dogs. In total 93 microorganisms were identified. Among these microorganisms, staphylococci species were the most isolated one in number (43%), followed by P. aeruginosa (17%), Escherichia coli (11%), Proteus spp. (9%), Streptococcus spp. (9%), Pasteurella spp. (3%), Citrobacter spp. (3%), Corynebacterium spp. (3%), and Enterococcus spp. (2%). Of the 16 P. aeruginosa strains examined, 13 (81%) were sensitive to gentamycin, 12 (75%) to penicillin G, 7 (44%) to danofloxacin, 6 (38%) to streptomycin, 3 (19%) to ampicillin, 2 (13%) to lincomycin, and 2 (13%) to tetracycline. In conclusion, gentamycin and penicillin could be more effective for the treatment of OE caused by P. aeruginosa in the Ayd›n region.