hypersensitivity pneumonitis


hypersensitivity pneumonitis
a respiratory hypersensitivity reaction to repeated inhalation of organic particles, usually in an occupational setting, with onset a few hours after exposure to the allergen. Characteristics include fever, fatigue, chills, unproductive cough, tachycardia, and tachypnea; in the chronic form there is interstitial fibrosis with collagenous thickening of the alveolar septa. There are many specific types (see table). Called also allergic or extrinsic allergic alveolitis.


Medical dictionary. 2011.

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