Equine ringworm due to Trichophyton mentagrophytes var. quinckeanum

Summary T. mentagrophytes var.quinckeanum was isolated from a case of equine tinea and this finding is thought to be unique. Although it is considered that the fungus is closely related toT. mentagrophytes, the small differences in the relative pathogenicity for animals and man, the unusual clinical pattern which can be seen, and the downy nature of primary isolates on Sabouraud's medium are features not to be expected withT. mentagrophytes infections. The ability of this fungus to produce green fluorescence in the hairs of infected guinea pigs is felt to be its most unique feature and warrants its separate identity asT. mentagrophytes var.quinckeanum.