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Farmer’s lung

Farmer’s lung is an alveolitis caused by an allergic reaction to fungal spores or to Micropolyspora faeni (a thermophilic bacterium found in moldy hay) that are inhaled from the moldy hay, grain, and straw. These biologic allergens incite a type III hypersensitivity inflammatory response, potentially progressing to a serious chronic condition. The condition begins at acute stage manifesting as a headache, cough, and shortness of breath. These symptoms develop within four to eight hours upon exposure to the allergens. The chronic stage includes symptoms such as chronic coughing, physical weakness, occasional fever, sweating at night, and general aches. Synonym: Threshers lung.


  1. NASD – Farmer’s Lung: It Takes Your Breath Away! (2019). Retrieved from Nasdonline.org website: http://nasdonline.org/1654/d001538/farmer-039-s-lung-it-takes-your-breath.html

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