Definition: a hypersensitivity pneumonitis characterized by fever and dyspnea, caused by inhalation of organic dust from moldy hay containing spores of thermophilic actinomycetes such as Micromonospora vulgaris, M. faeni, and Thermopolyspora polyspora, which thrive in the elevated temperatures of hay lofts and silos; repeated exposure may result in alveolar sensitization and, ultimately, granulomatous lung disease with severe disability.
Synonym(s): thresher's lung
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