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First Report of Trichosporon ovoides Isolated from the Home of a Summer‐Type Hypersensitivity Pneumonitis Patient

Trichosporon species have been known to cause summer‐type hypersensitivity pneumonitis (SHP). During the isolation of yeasts from an SHP patient's house, we recovered a strain belonging to the genus Trichosporon. Morphologically, the isolate produced rectangular arthroconidia when grown on corn meal agar. DNA‐DNA hybridization experiments identified the isolate as T. ovoides. A slide agglutination test using specific factor sera demonstrated that the serotype of the strain was type II. Previously, T. asahii, a serotype II species, was considered to be the major antigen of SHP, but it is possible that T. ovoides may also be responsible for SHP. This is the first report of T. ovoides isolated from an SHP patient's home environment.