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Studies in otitis externa in dogs

Domenii publicaţii > Ştiinţe medicale + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Cristina R. T., Degi J

Editorial: Veterinary Clinical Pathology, ISSN 0275-6383, 36, 4 , p.396, 2007.


Having a multifactorial aetiology, otitis externa (OE) is spread in almost all canine populations. The main factors that determine inflammation of the ear are local causes, hypersensitivity, parasites, fungi, viral diseases, pollution and other unidentified factors. Our study was accomplished in the period September 2003 – October 2006 in canine populations of Timisoara city, with 3278 canines of 48 breeds being examined. Among these, 689 dogs of 24 breeds were found to be affected by otitis. Ear samples were obtained from canines of different ages and sex using standard techniques. Bacteriological and mycological examinations were made on otic exudates by placing them in 5% blood agar, Sabouraud’s bullion and agar media and incubating at 37sC for 18-20 hours for bacteriological cultures and at 30-37sC for 2-5 days in the case of mycological cultures. After this, plates were visualised with a stereoscopic magnifier. Colonies from each pale were obtained, and smears were stained with Gram, Giemsa and methylene blue, and bacterial and fungal morphologic characteristics were observed. For accuracy two quick field identification tests for Stahylococcus spp. and Streptococcus spp. Bactident-Stap (Merck) and Slidex Strepto-Kit (Biomerieux) were also performed. Antibiotic sensitivities were tested for all isolated bacteria and fungi using difusometric methods. From a total of 689 canine OE cases, a significant percentage (74.60%, 514 cases) were of infectious origin. Bacterial otitis was found in 163 cases (31.71%) and of these German dogs (38.09%), Mastiffs (36.36%), and Shi Tzus (33.33%) were most affected breeds. Mycotic otitis was found in 52.33% of all cases, being the most important cause of OE in this research. The most frequent cases were identified in Cane Corso (57.14%), Caucasian Shepherd dogs (56.0%) and British Bulldogs (55.55%). Mixed infections were found in 15.95% of OE cases with the presence of foreign bodies in 9.58% of total cases. The most affected breeds were Bull Terriers (33.33%), Bracks (23.64%), and Vizslas (20.59%). Parasitic and allergic conditions were found in 7.70% and in 8.12%, respectively, of all cases with a preponderance of parasites in Afghan Greyhound (26.08%), Cocker Spaniels (16.32%) and German Shepherds (13.20), Bull Terriers (23.08%), Chow Chow (23.53%) and Poodles (22.05%) breeds formed the majority of allergy cases. In all observed cases, males (56.77%) were more often affected by OE than females (43.20%). Acute otitis (63.55%), erythematous otitis (69.49%) and unilateral otitis (79.66%) were most frequently seen in the studied cases. Otitis externa was found more often in the young age category of 2-5 years (36.44%) than the older doge in the 5-10 years category (24.57%).

Cuvinte cheie: otitia externa, caini // otitis externa, dogs