Farmer's lung

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Farmer's lung Classification and external resources
ICD-10	J 67.0
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)

v • d • e Health science - Medicine - Allergic conditions

Respiratory system	Allergic rhinitis · Asthma · Hypersensitivity pneumonitis · Eosinophilic pneumonia · Churg-Strauss syndrome · Allergic bronchopulmonary aspergillosis · Farmer's lung

Skin	Angioedema · Urticaria · Atopic dermatitis · Allergic contact dermatitis · Hypersensitivity vasculitis

Blood and immune system	Serum sickness

Circulatory system	Anaphylaxis

Digestive system	Coeliac disease · Eosinophilic gastroenteritis · Food allergy · Milk intolerance

Nervous system	Eosinophilic meningitis

Genitourinary system	Acute interstitial nephritis

Other conditions	Drug allergy · Allergic conjunctivitis