Microsponun canis was the most frequently isolated dennatophyte between 1982 and 1984, with an incidence of 45.19%. This dermatophyte caused almost all cases of tinea capitis (94.99%) and the mqjority of cases of tinea corporis (75.73%). Some epidemiological data are reported, as well as certain cases with an atypical morphology. Zusammenfassung: Vom Jahre 1982 bis 1984 war Microsponun canis der am haufigsten isolierte Dennatophyt, mit einer Haafgkeit von 45,19%. Dieser Dennatophyt verursachte die meisten ' F i e von Tiea capitis (94,99%), wie auch von Tmea corporis (75,73%). Es wird uber einige epidemiologische Angaben und atypische Bdder berichtet. Microsporum canis frequently parasitizes cats at an incidence that, according to Morganti et al. in Italy, varies from 18.2% to 37.lo/o, and more rarely 5.4% to 11.5% dogs (8,9). In animals the disease can even be asymptomatic, and young long-haired animals are the most frequently affected.Recent data relating to the epidemiology ofhuman infection have shown that M. canis presentsa high incidence in many European countries (3,11,13,15), as well as in the U.S.A., particularly in Arizona (12). In Italy, M. canis is frequent (2) and is, according to research done by Caprilli et al. (l), Papini and Simonetti (lo), and ourselves (4,5,6), the most frequentlyisolated dermatophyte. Italy has even been considered the "container" ofthis dermatophyte by some neighboring countries. Wagner and Winkler (15) report M. canis infections in Germans who had spent their holidays in Italy and Lunder (7) interprets an increased incidence of M. canis dermatophytosis in Slovenia, both human and feline, as the result of the geographical proximity to Italy and Italian tourism.