The formation of macroconidia in dermatophytes following UV irradiation and temperature treatment.

The ability of sterile hyphae of Epidermophyton and Microsporum to produce macroconidia was restored by exposing hyphae to ultra violet irradiation followed by prolonged incubation at 35 degrees C. The four species of Trichophyton used in the present study did not produce macroconidia after such treatments.