Abstract
We reported a 11-year-old boy with hypersensitivity pneumonitis diagnosed by BAL and TBLB. The precipitating antiboby against Trichosporon cutaneum was observed in the serum of this patient. In mycological study of house dust, Trichosporon cutaneum was isolated from his house, and the same respiratory symptoms recurred when he returned to his home. Based on these results, Trichosporon cutaneum was considered to be the most suspicious etiologic agent. Examination of his family revealed that two another members had positive precipitating antibodies against Trichosporon cutaneum and one of the two had had similar symptoms to this patient for the past two years.
To prevent the recurrence and chronic change of summer-type hypersensitivity pneumonitis, it is important to perform the mycological studies and to instruct their family about the cleaning of their houses correctly.
