A form of alveolitis or pneumonitis due to an acquired hypersensitivity to inhaled antigens associated with farm environment. Antigens in the farm dust are commonly from bacteria actinomycetes (SACCHAROPOLYSPORA and THERMOACTINOMYCES), fungi, and animal proteins in the soil, straw, crops, pelts, serum, and excreta.

Synonyms: Mushroom Workers Lung, Farmer Lung, Farmer's Lungs, Mushroom Worker's Lung, Farmers Lung, Mushroom Worker Lung, Mushroom Worker's Lungs, Farmer's Lung