Abstract
Summary
Sera from patients with farmers' lung, pigeon breeders' disease, bagassosis, and maple bark strippers' disease were examined for the presence of precipitating antibodies against the corresponding antigenic materials. All sera showed reactions with 3 or 4 of the antigens. The one exception was the serum from the patient with maple bark strippers' disease, which reacted only with the antigens thought to cause the disease.
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