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In a 5-year period, 11 cases of farmer's lung were seen in Caithness giving a prevalence in the total population of 7.8 per 100,000 per year and in the farming population, 110 per 100,000 per year. A serological survey of 50 healthy farmers revealed 4 with anti-complementary reactions in the complement fixation test for M.faeni and none with positive gel diffusion tests for F.L.H. precipitins. The prevalence of this disease may have a correlation with rainfall.
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D. H. A. Boyd (1971) studied this question.
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