Abstract:
Yeasts are commensal organisms frequently isolated from the skin and mucous membranes of domestic and wild mammals. Although yeasts are frequently isolated from women’s vaginal mucus, similar studies in canine are rare, therefore their behaviour during the canine oestrous cycle is unknown. The purpose of this study was to isolate yeasts from the vaginal microbiota of bitches and to evaluate their behaviour in different stages of the oestrous cycle. We examined 75 samples of mucus from the vaginal cavity of 75 domestic bitches and 224 samples from 14 experimental bitches. The stages of the oestrous cycle were characterized through vaginal cytology and clinical observation of bleeding, vulvar oedema and pucker. Samples were examined visually, and also cultured in Sabouraud dextrose agar with chloranphenicol, at 37 ºC for 10 days. The yeasts were classified according to their macro and micro morphology, biochemical tests, germination tube and micro culture. Yeasts were isolated from 25 (33.3%)
samples from domestic females. Among the samples collected during proestrous, oestrous, diestrous and anestrous, 56.3% 16.7% 66.7% and 20.5% were positive, respectively. Yeasts were isolated from 147 (65.6%) samples from experimental bitches. Among the samples collected during proestrous, oestrous, diestrous and anestrous, positive samples represented 61.9%, 71.9%, 82.7%, and 57.1%,respectively. The identified species were Candida spp, M. pachydermatis and Rhodotorula spp, which are commonly present in the vaginal mucus microbiota of healthy bitches and their frequency changes with the different stages of the oestrous cycle.
Hongos levaduriformes son aislados frecuentemente de los animales domésticos y silvestres, siendo algunos comensales del tegumento y mucosas. Las levaduras son frecuentes en la mucosa vaginal de las
mujeres, pero en perras son escasos los estudios referentes a la microbiota
fúngica vaginal, sin conocerse su relación con el ciclo reproductivo. En este estudio se buscó aislar e identificar levaduras de la microbiota vaginal de perras, y establecer si hay alteración de la microbiota
levaduriforme en las fases del ciclo reproductivo. Se analizaron 75 muestras de la vagina de 75 perras de los caniles particulares (Grupo I) y 224 muestras de 14 perras experimentales (Grupo II). El ciclo estral fue determinado por citología vaginal y se registraron observaciones clínicas como sangrado, edema y pliegues de vulva. Las muestras fueron sometidas a examen directo y cultivos en Agar-Sabouraud dextrosa con cloranfenicol, a 37 ºC por 10 días. Las levaduras fueron clasificadas por macro y micromorfología, pruebas bioquímicas, tubo germinativo y microcultivo. De las 75 muestras del grupo I, el aislamiento
fue 33,3% (n = 25); las muestras fueron obtenidas en las fases de proestro 56,3%, estro 16,7%, diestro 66,7% y anestro 20,5%, respectivamente. De las 224 muestras del grupo II se aislaron levaduras en 147 (65,6%): en proestro 61,9%, estro 71,9%, diestro 82,7% y anestro 57,1%, respectivamente. Las levaduras fueron identificadas como Candida spp, Malassezia pachydermatis y Rhodoturola spp. Los resultados sugieren que estas levaduras forman parte de la microbiota vaginal de perras sanas y sus frecuencias se alteran en las fases del ciclo reproductivo.
