Abstract
14 cases of tinea corporis, blackdot ring worm and Kerion celsi in the same Judo club (except 1 girl) caused by T.tonsurans are reported. Their ages are from 7 to 13 years old. They are treated by antifungal ointment only. But gradually their symptoms exacerbated and then T.tonsurans infections soon spread in the club members. Direct examination of the scaly erythema revealed hyphae and hair examination revealed endothrix with numerous large spores. Culture in DTM media yielded yellowish-brown powdery colonies. The colonies of 7 out of 14 cases were determined T.tonsurans by PCR-RFLP analysis of ribosomal DNA regions due to T.tonsurans by Prof. Mochizuki. T.tonsurans made endothrix infection within 14 days after the penetration in the stratum corneum. Protect for expansion of T.tonsurans infection is important problem. Before made endothrix, early orally antifungal administration is most necessary .
