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Definition
Acute, non-allergic, flu-like illness after heavy inhalation of organic dust (e.g. grain, mouldy hay, wood chips).
Pathogenesis
Caused by endotoxins, mycotoxins and microbial products; not immune-mediated (distinguishes from hypersensitivity pneumonitis).
Cytokines and complement Cascade. Not immunological
Clinical features
Fever, chills, myalgia, malaise, cough, chest tightness; occurs 4–12 hrs after exposure.
Investigations
Normal chest X-ray and lung function; neutrophilia common, no specific antibodies
Prognosis
Self limiting
No antibiotics or steroids
List 3 inhalation fevers
Metal fume fever
Polymer fume fever
Organic dust toxic syndrome