Trichosporon asahii is the most clinically important pathogenic yeast in th
e genus Trichosporon, as this species causes both deep-seated infection and
summer-type hypersensitivity pneumonitis. We isolated 29 T. asahii colonie
s from environmental samples using the polymerase chain reaction (PCR) and
dichloran rose bengal chloramphenicol (DRBC) medium. Our results suggest th
at T. asahii is common in nature.