An interstitial lung disease involving inflammation of alveoli and smallest airways (bronchioles) of the lung caused by an allergic reaction to inhaled organic dusts containing microorganisms or proteins, and chemicals. Symptoms include chills, cough, fever, malaise, shortness of breath, loss of appetite and weight loss. [ http://purl.obolibrary.org/obo/ECO_0007637 http://purl.obolibrary.org/obo/ECO_0007640 ]