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What is Which of the following is associated with hypersensitivity pneumonitis - and explain in detail?
Hypersensitivity pneumonitis 

Hypersensitivity pneumonitis describes a spectrum of immunologically mediated*, predominantly interstitial lung disorders caused by intense, often prolonged exposure to inhaled organic dust and related occupational antigens.
Etiology: Inhalation of organic dust, most commonly spores of thermophilic fungi*.
Depending on the occupation or exposure of specific antigen numerous names have been given to hypersensitivity pneumonitis.



Farmer's lung → Thermophilic actinomycetes on mouldy hay or grain dust.


Pigeon breeder's lung → Proteins from serum, excreta or feathers of the birds.


Air conditioner lung (or Humidifier lung) → Thermophilic bacteria in heated water reservoirs.


Bagassosis → Sugarcane bagasse


Byssinosis → Cotton dust


Maple-bark disease → Mouldy maple bark


Mushroom-worker's lung → Mushroom compost dust


Silo-filler's disease → Toxic fumes of NO & N2O due to fermentation of silage