Isolation in the United States of a culture resembling M. praecox.

A Microsporum culture isolated in the United States, from a clinical case of tinea corporis, was noted to have microscopic features resembling Rivalier's description of Microsporum (Sabouraudites) praecox (11). This unusual finding prompted further taxonomic studies, the results of which suggest that the new isolate may be either the first strain of Microsporum praecox (or a variety thereof) to be isolated in North America or, possibly, a new species.