[Farmer's lung in the east of Hokkaido. A follow-up study in 1985].

The follow-up study of 16 patients with farmer's lung and 35 farmers having antibody to thermophilic actinomyces was performed. The following results were obtained. Three patients out of 16 patients with farmer's lung were readmitted to the hospital. The patients out of 11 believed that the dust respirator is useful for prevention against the development of farmer's lung. Any new patient was not found out from farmers having antibody to thermophilic actinomyces in 1985.