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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
• India has the bulk of the population engaged in agricultural work – the condition might be widespread in the country

• Chapter 1 - Dust: Definitions and Concepts; Hazard Prevention and Control in the Work Environment: Airborne Dust WHO/SDE/OEH/99.14 available at:, accessed on 16th Feb 2017
• Park’s Textbook of Preventive and Social Medicine

Types of Pneumoconiosis:






Farmer’s Lung:

Lecture on Pneumoconiosis: