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Coryneform bacteria associated with canine otitis externa.

Bent Aalbæk¹, David A Bemis, Mette Schjærff

¹Department of Veterinary Disease Biology, Faculty of Life Sciences, University of Copenhagen, 1870 Frederiksberg C, Denmark. baal@life.ku.dk

Veterinary Microbiology

|May 4, 2010

Summary

Coryneform bacteria, including Corynebacterium auriscanis, are potential secondary pathogens in canine otitis externa. These bacteria were frequently isolated from inflamed dog ears but not healthy ones, suggesting a role in ear infections.

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Area of Science:

Veterinary Microbiology
Canine Health
Infectious Diseases

Background:

Canine otitis externa is a common condition with various causative agents.
The role of coryneform bacteria in canine otitis externa is not fully understood.
Improved knowledge on frequency and clinical significance of coryneform bacteria is needed.

Purpose of the Study:

To investigate the occurrence and frequency of coryneform bacteria in canine otitis externa.
To determine the clinical significance of coryneform bacteria in canine ear infections.
To identify the specific coryneform species involved in canine otitis externa.

Main Methods:

A combined case series and case-control study design was employed.
Samples from canine otitis externa cases and healthy dogs were analyzed.
Coryneform bacteria were identified using partial 16S rRNA gene sequencing.

Main Results:

Coryneform bacteria were identified in 16% of canine otitis externa cases.
Corynebacterium auriscanis was the most prevalent species, followed by C. amycolatum and C. freneyi.
Coryneform bacteria were isolated alongside other bacteria like Staphylococcus pseudintermedius and Malassezia pachydermatis.
Some isolates showed resistance to common antimicrobials like fusidic acid and enrofloxacin.
Coryneform bacteria were not detected in samples from healthy dogs.

Conclusions:

Coryneform bacteria, particularly Corynebacterium auriscanis, are potential secondary pathogens in canine otitis externa.
These bacteria may proliferate in the inflamed ear canal environment.
Further research is warranted to elucidate their precise role and treatment strategies.