Valor diagnóstico del examen citólogico en las otitis externas de caninos

Boehringer, S. I.
May 2011
Revista Veterinaria;2011, Vol. 22 Issue 1, p38
Academic Journal
Malassezia are lipophilic yeast, commensal organisms ofhuman and animal skin. The yeast has often been isolated from otitis externa cases as the most common organism and complicating factor. The purpose of this study was to evaluate the effectiveness of cytology as a diagnostic methodology in canine external otitis in Corrientes City (Argentina). amples from the auditory tube of95 dogs with otitis and from 95 healthy dogs were obtained. Sterile cotton swabs were used to collect specimens from the external ear canal and then cultured in agar abouraud and modified Dixon's agar. Cytological examinations were performed to detect the presence and population size of Malassezia yeast. Each swab was rolled on a clean glass slide and stained with Gram Kopeloff. Ten fields were examined microscopically using an oil immersion objective (lOOOx magnification). The isolation of M pachydermatis in dogs with external otitis (70.52%), in relation to the healthy animals (28.42%) was significant (p<0.05). The agreement between cytological results and fungal cultures were also statistically significant. The performance of the cytological examination and the culture showed a sensitivity around 75.79% and 70.53%; specificity was 50.53% and 71.58%; whereas predictive values were 60% and 70%, respectively. Cytological examination of otic exudate confirms Malassezia overgrowth. ln the present investigation the results indicated that 2: 10 yeast count per high- power fields (oil immersion objective) allows to identify and characterize the microbial infection. Nevertheless, considering the test sensitivity and low specificity obtained attributable to the unequal distribution of yeast observed in the healthy population, it is necessary to use two or more simultaneous techniques to detect Malassezia, determine the medical significance, and confirm infection.


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