Abstract
Trichosporon species frequently induce summer-type hypersensitivity pneumonitis (SHP), which is the most prevalent type of hypersensitivity pneumonitis (HP) in Japan, but have not been reported to induce asthma. Evaluation of a case of asthma induced by Trichosporon asahii. This report describes a 46-year-old Japanese man who developed asthma induced by T. asahii, following symptoms of HP attributable to the same pathogen, in a case of familial occurrence of SHP. This patient lacked typical findings of HP in his radiograph but had an elevated level of eosinophils in his bronchoalveolar lavage fluid. Open lung biopsy, however, revealed typical pathologic findings of HP when he was free of asthmatic symptoms. His serum was also positive for anti-T asahii antibody, as are the sera of SHP patients. Nevertheless, provocation tests, including returning home and inhalations of T. asahii antigen, reproduced asthmatic features such as airway hyperresponsiveness and reversible bronchoobstruction, but not the features of HP. A skin test with the same antigen also evoked an immediate allergic reaction. An IgE mechanism was suspected but could not be proven by radioallergosorbent test. The patient's son and daughter displayed typical featur...Continue Reading
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