Hypersensitivity pneumonitis due to organic dust

**Definition:** Hypersensitivity pneumonitis due to organic dust is an inflammation of the alveoli, terminal bronchioli and the interstitium within caused by hypersensitivity to inhaled organic dusts, such as allergens derived from fungal, bacterial, animal protein.

**Exclusions:** - Airway disease due to specific organic dust - pneumonitis due to inhalation of chemicals, gases, fumes or vapours