➤ How does hypersensitivity pneumonitis develop and which exposures cause it?
Hypersensitivity pneumonitis occurs when the immune system reacts to inhaled antigens. Common triggers include bird proteins, thermophilic actinomycetes in moldy hay (farmer’s lung), and fungal spores from damp environments. Repeated exposure causes alveolar inflammation, cough, and breathlessness; removing the antigen early reduces chronic damage.
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