EN
The aim of this paper was to present the first case of otitis externa caused by Chromobacterium violaceum in a dog in Poland. The studies involved a cross-breed dog aged 10 years with symptoms of chronic inflammation of the external auditory meatus. Inflammatory lesions of the external auditory meatus occurred directly after the dog swam in open water. Swabs were collected from the dog’s ears for microbiological and parasitological tests. No parasites capable of causing inflammation of the external auditory meatus were found. From a culture of the inflammatory secretion from the ears on blood agar, a clean culture of violet bacteria was isolated and recognized as Chromobacterium violaceum on the basis of an Api 20 test. Targeted therapy with antibiotics based on the systemic and local use of fluoroquinolones led to a complete resolution of the symptoms within two weeks. On the basis on the results of the clinical and microbiological tests conducted, as well as the effect of treatment, it was concluded that the etiological factor for the inflammation of the external auditory meatus in the dog were Chromobacterium violaceum microbes.