<unk>  <unk> , also called extrinsic allergic alveolitis (EAA), is not a single disease but is a complex syndrome of varying intensity, clinical presentation, and natural history.
The syndrome was first described in Iceland in 1874 and termed heykatarr. The syndrome is caused by sensitization to repeated inhalation of dusts containing one of 300 organic antigens. These organic dusts come from a wide variety of sources but most commonly include:
Dairy and grain products
Animal dander and protein
Wood bark
Water reservoir vaporizers
The two most common antigens are:
As a rseult of exposure to thee antigens, the two most common causes (i.e. diseases) are:
Pathologically, the<unk>  syndrome is associated with diffuse inflammation of lung parenchyma and airways.
Based on the length and intensity of exposure and subsequent duration of illness, there are 3 clinical presentations of<unk> :
Synonyms and related keywords:<unk> ,<unk> , bird fancier's lung, extrinsic allergic alveolitis, farmer's lung, Saccharopolyspora rectivirgula, S rectivirgula, Micropolyspora faeni, M faeni, Thermoactinomyces sacchari, T sacchari, Thermoactinomyces vulgaris, T vulgaris, Penicillium casei, P casei, Aspergillus clavatus, A clavatus, Mucor stolonifer, M stolonifer, Sitophilus granarius, S granarius, Cladosporium, heykatarr, bagassosis, grain handler's lung, humidifier lung, air-conditioner lung, bird breeder's lung, cheese worker's lung, malt worker's lung,paprika splitter's lung, mollusk shell<unk> , chemical worker's lung, pulmonary disease, lung disease.
Hypersensitivity pneumonitis
Chemical pneumonitis
CMV pneumonitis
Diffuse panbronchiolitis
Atypical pneumonia
Eosinophilic pneumonia
Idiopathic interstitial pneumonia
Pulmonary alveolar proteinosis