Comparison of microbial isolates and susceptibility patterns from the external ear canal of dogs with otitis externa.
Otic exudate was obtained from 33 dogs with otitis externa for cytopathology and culture. Two samples were taken from the same location in the external ear canal, for a total of 100 samples. Thirty-six (36%) samples isolated only a single organism, of which 21 (21%) were Malassezia spp. Two organisms were present in 23 (23%) of the samples. Cultures of the two samples agreed in 40 (80%) of the 50 pairs. Cytopathology agreed with culture results only 68% of the time. Cytopathology and culture may not be as definitive as previously assumed because of apparent variability of the microbial population within the external canal.
Department of Small Animal Clinical Sciences, Veterinary Medical Center, College of Veterinary Medicine, Michigan State University, East Lansing, Michigan 48824, USA.
Christine A
CA
Graham-Mize
Edmund J
EJ
Rosser
D000818:Animals; D000900:Anti-Bacterial Agents / Q000627:therapeutic use*; D015169:Colony Count, Microbial / Q000662:veterinary; D004283:Dog Diseases / Q000188:drug therapy / Q000382:microbiology*; D004285:Dogs; D004424:Ear Canal / Q000382:microbiology*; D008290:Malassezia / Q000187:drug effects / Q000254:growth & development / Q000302:isolation & purification*; D008826:Microbial Sensitivity Tests / Q000662:veterinary; D010032:Otitis Externa / Q000188:drug therapy / Q000382:microbiology / Q000662:veterinary*; D010034:Otitis Media with Effusion / Q000382:microbiology / Q000662:veterinary; D011550:Pseudomonas aeruginosa / Q000187:drug effects / Q000254:growth & development / Q000302:isolation & purification; D013210:Staphylococcus / Q000187:drug effects / Q000254:growth & development / Q000302:isolation & purification
D000900:Anti-Bacterial Agents