Farmer’s Lung
• Due to inhalation of moldy hay or grain dust (hypersensitivity pneumonitis)
• Grain dust or hay with a moisture content of >30%,
– bacteria and fungi grow rapidly in the dust
– causing rise of temperature of 40 – 50⁰C
• This heat promotes growth of:
– Thermophilic actinomycetes esp. Micropolyspora faeni which causes Farmer’s lung
• Acute Illness
– General and respiratory symptoms and physical signs
• Repeated attacks of acute illness cause
– pulmonary fibrosis and inevitable pulmonary damage and
– Finally Corpulmonale