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September 1962

Human Infection Due to a New Microsporum Species

Author Affiliations


From the Department of Dermatology (Dr. Henington, Dr. Kennedy, and Dr. Perret), Louisiana State University School of Medicine, and the Department of Microbiology (Dr. Friedman), Tulane University School of Medicine.

Arch Dermatol. 1962;86(3):298-304. doi:10.1001/archderm.1962.01590090040011

Microsporum vanbreuseghemii was first isolated in 1959 from a squirrel1,2 and in 1960 from a dog.1 Because of a deceptive resemblance to Keratinomyces ajelloi, these isolates initially were mistaken for K. ajelloi, and the squirrel isolate was so described.2 In 1961, two more strains identical to those isolated from the dog and squirrel were cultured from human infections seen in our clinic. It was finally realized that these 4 isolates represented a new species of Microsporum, which has been described by Georg et al. and named M. vanbreuseghemii.1 The course of the disease in the 2 human patients with comments on the differential morphology of the 2 dermatophytes, K. ajelloi and M. vanbreuseghemii, are reported herein.

Case Histories 

Case 1.—  A 6-year-old girl was first seen Dec. 12, 1960, with a history of an infected scalp for the past week. The lesion had progressed rapidly, in