Var. raubitschekii of Trichophyton rubrum as a cause of tinea in Germany

Summary Trichophyton raubitschekii was originally described as a distinct dermatophyte species but is now classified as a variant of Trichophyton rubrum. The variant raubitschekii differs from common strains of T. rubrum with regard to morphology, physiology, epidemiology and patterns of infection. It is mostly found in Africa, Asia and South America, but the literature and our observations reveal that seven patients (four men, three women) with T. rubrum var. raubitschekii ‐infections were meanwhile seen in Germany. All of them were born in Africa and they suffered from tinea corporis or tinea pedum, but onychomycosis was seen as well. All strains matched the typical characteristics of the variant raubitschekii except that one strain had a minimal capacity to perforate hair. Until now, the strains of T. rubrum var. raubitschekii isolated in Germany were probably imported by migration of the patients and so far no further spreading within Germany was observed. However, such a spreading is likely to occur in the future and therefore a monitoring is needed. This can be achieved only when the variant raubitschekii is looked for in the laboratories and is reported with its full name.