Farmer's lung

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Farmer's lung Classification and external resources
ICD-10	J67.0
ICD-9	495.0
DiseasesDB	29636
eMedicine	med/771
MeSH	D005203

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Farmer's lung is a hypersensitivity pneumonitis induced by the inhalation of biologic dusts coming from mouldy hay or other agricultural products. The immune response is most often initiated by exposure to thermophilic actinomycetes, which generates IgG-type antibodies that circulate in the bloodstream. Following a subsequent exposure, IgG antibodies combine with the inhaled allergen and form immune complexes. These complexes are deposited in the lung and generate an inflammatory response typical of a type III hypersensitivity response.

Farmer's lung is an example of extrinsic allergic alveolitis.

v • d • e Pathology of respiratory system (J, 460-519), respiratory diseases Upper RT (including URTIs) Acute Common cold - Rhinitis - Sinusitis - Pharyngitis (Strep throat) - Tonsillitis - Laryngitis - Tracheitis - Croup - Epiglottitis Other nose disease (Vasomotor rhinitis, Hay fever, Atrophic rhinitis, Nasal polyp, Deviated septum) - Adenoid hypertrophy - Peritonsillar abscess - Vocal fold nodule - Laryngospasm Lower RT (including LRTIs) Pneumonia Viral - Bacterial - Bronchopneumonia Other acute Bronchitis (Acute, Chronic) - Bronchiolitis Chronic Emphysema - COPD - Asthma (Status asthmaticus) - Diffuse panbronchiolitis - Bronchiectasis Lung diseases due to external agents Pneumoconiosis (Asbestosis, Bauxite fibrosis, Berylliosis, Caplan's syndrome, Chalicosis, Coalworker's pneumoconiosis, Siderosis, Silicosis) - Byssinosis - Hypersensitivity pneumonitis (Bagassosis, Bird fancier's lung, Farmer's lung) Other lung disease, principally affecting the interstitium ARDS - Pulmonary edema - Löffler's syndrome - Eosinophilic pneumonia - Interstitial lung disease (Hamman-Rich syndrome, Idiopathic pulmonary fibrosis) Suppuration Empyema - Lung abscess Other pleural disease/pleural effusion (Pneumothorax, Hemothorax, Hemopneumothorax, Hydrothorax) mediastinal disease (Mediastinal emphysema, Mediastinitis) Mendelson's syndrome - Atelectasis Other/general Respiratory failure - Influenza - SARS see also congenital (Q30-Q34, 748)

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