Microsporum canis causing dermatophytosis in cats is also often the ca
usative organism for human dermatophytosis. The main source of infecti
on are infected cats. The spreading of the dermatophyte from cat to ca
t takes mostly place during exhibitions or in cat-breedings. The size,
appearance and number of the dermatophyte lesions vary. The typical s
ymptoms are round lesions with a erythemic margin. Such alterations ar
e also seen on the face, the body and the extremities of humans. To se
cure the diagnosis a skin scraping should be examined in a mycological
laboratory. The treatment should be carried out with local antimycoti
ca and in addition by systemic treatment with Griseo-fulvin or Ketocon
azol. To eliminate the pathogen from the population of cats of one reg
ion is an illusion but it seems possible to cure the cat-breedings. Th
e cooperation between the associations of cat breeders, veterinarians
and mycological laboratories is a precondition of mycosis-control.