Ringworm dermatitis is the second most frequent dermatopathy (29.8%) o
f all the feline cases attended at the Dermatological Service of the V
eterinary Teaching Hospital at the University of Sao Paulo (USP). Desp
ite the zoonotic potential and the importance of the ringworm symptoma
tic forms at the veterinary dermatological practice, there are few Bra
zilian scientific papers focusing on its importance. Between 1981-1990
, 348 domestic cats with ringworm-like lesions were examined at the Ve
terinary Teaching Hospital of USP. After the avulsion of the perilesio
nal hair, the specimens were inoculated in Sabouraud dextrose agar wit
h 100 mug/ml chloramphenicol and mycobiotic agar, incubated at 25-degr
ees-C and 37-degrees-C, and the identification of molds and yeast was
made. Pathogenic dermatophytes were isolated from 130 samples (37.3%).
From these positive cultures, 129 (99.2%) and 1 (0.78%), respectively
, were due to M. canis and M. gypseum. About 68% of the cats were less
than 1 year old and 54.6% were males. The great majority of the isola
tion (70%) was obtained from crossbred animals.