Clinical Atlas of Interstitial Lung Disease

pp 91-95

Hypersensitivity Pneumonitis

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Hypersensitivity pneumonitis (HP), or extrinsic allergic alveolitis, is an immunologically induced inflammatory disease caused by repeated inhalations of a variety of agents, including organic dusts and active chemicals. There are many types of HP, such as farmer’s lung, bird fancier’s lung, ventilation pneumonitis, summer-type HP, and chemical worker’s lung, but the clinical features are similar irrespective of the specific causative agent (Table 16.1).