Identification and antibiotic susceptibility of bacterial isolates from dogs with otitis externa in Australia.
OBJECTIVE
To identify and quantify the five most frequently isolated significant bacterial microorganisms, and their antibiotic susceptibility, from bacterial cultures of samples taken from the ears of dogs with otitis externa.


METHODS
Bacterial culture and susceptibility testing data for ear swabs from dogs with presumed otitis externa were collated and evaluated.


RESULTS
The five most frequently isolated microorganisms were: Pseudomonas aeruginosa, Staphylococcus pseudintermedius, Proteus sp., beta-haemolytic streptococci and Escherichia coli. Susceptibility to gentamicin was very high for most isolates, whereas for polymyxin B, high levels of resistance were seen. Beta-haemolytic streptococci had high levels of resistance to all of the antibiotics tested.


CONCLUSIONS
This study provides veterinarians with Australian data to assist in cytological interpretation and initial empirical therapy of canine otitis externa.
MSD Animal Health, Bendigo, Victoria, Australia. darren.bugden@merck.com
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D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology / Q000627:therapeutic use*; D001315:Australia; D015169:Colony Count, Microbial / Q000662:veterinary; D004283:Dog Diseases / Q000188:drug therapy / Q000382:microbiology*; D004285:Dogs; D004305:Dose-Response Relationship, Drug; D024881:Drug Resistance, Bacterial; D004926:Escherichia coli / Q000187:drug effects / Q000302:isolation & purification; D005260:Female; D008297:Male; D008826:Microbial Sensitivity Tests / Q000662:veterinary; D010032:Otitis Externa / Q000188:drug therapy / Q000382:microbiology / Q000662:veterinary*; D011511:Proteus / Q000187:drug effects / Q000302:isolation & purification; D011550:Pseudomonas aeruginosa / Q000187:drug effects / Q000302:isolation & purification; D013210:Staphylococcus / Q000187:drug effects / Q000302:isolation & purification; D013291:Streptococcus / Q000187:drug effects / Q000302:isolation & purification; D016896:Treatment Outcome
D000900:Anti-Bacterial Agents