In the eastern bank area of the Abe River flowing through Shizuoka City, there flourishes the wooden wares industry manufacturing ready timber, furniture, stereo-cabinets, orgel music boxes, geta clogs, etc. Among the craftsmen engaging in such occupations, the symptoms of inhalative asthma supposed to be caused by many kinds of lumber are often found. And in this report, accordingly, a case with bronchial asthma is stated, who was lately treated and observed, and finally concluded to be caused by mulberry lumber. Y.F., a lumber processor, 27 years of age, took employment in wooden wares industry 10 years ago. And these 8 years he has stuck mulberry board to the surface of chests of drawers to finish it with elaborate grain. The asthmatic attacks have frequently occured in the later 4 years without any connection with diet. On the first day when he visited our clinic, a slight peripheral leucocytic eosinophilia was observed. The intracutaneous test with kinds of the inhalatory allergen extracts was carried out, and consequently positive reaction to house dust and cat's tail pollen (typha angustata) was proved. The hyposensitization therapy with these allergen extracts was not complacently successful, but asthmatic attacks still occured ever after the work using mulberry board. Accordingly, the intracutaneous test, Prausnitz-Kustner's passive transfer test and the inhalative provocation test with self-prepared extract of mulberry lumber were carried out and consequently positive reactions were acquired by them. And the hyposensitization therapy with mulberry lumber extract, in addition to house dust and cat's tail pollen extracts, was performed with satisfaction. Judging from the above-mentioned clinical history and the results of allergic investigations, this case is considered to be the subject with occupational allergic asthma caused by mulberry lumber.
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