A glabrous Microsporum canis in Greater London.

A variant of Microsporum canis, which produces glabrous colonies on primary culture, has been frequently isolated from cases of scalp and body ringworm by this department. The records of this laboratory, which undertakes a diagnostic service covering most of the Greater London Area, show that the prevalence of M. canis among scalp infections has increased during the past ten years, and this species is presently responsible for the majority of cases diagnosed by culture. The glabrous form now represents one third of the scalp isolates of M. canis and it has been found most commonly in the West and South of Greater London.