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*Often associated with bacteria, mycoplasma or immunosuppressive viruses (such as PRRS)
*Often associated with bacteria, mycoplasma or immunosuppressive viruses (such as PRRS)
*The virus recycles on farms as litters outgrow maternal antibody at 12 weeks of age
*The virus recycles on farms as litters outgrow maternal antibody at 12 weeks of age
===Diagnosis===
===Diagnosis===
*Clinical pneumonia is always suspect
*Clinical pneumonia is always suspect
*All-in/all-out systems
*All-in/all-out systems
*Vaccination is not licensed in the UK
*Vaccination is not licensed in the UK
*Caused by [[Orthomyxoviridae]]
*[[Nasal Cavity Inflammatory - Pathology|Rhinitis]], may progress to [[Lungs Inflammatory - Pathology#Infectious causes of pneumonia|pneumonia]]
*Clinical signs: pyrexia, lethargy, skin erythema, anorexia, severe cough and sneezing, dyspnoea, conjunctivitis, pregnant sows may abort
*Grossly:
**[[Trachea Inflammatory - Pathology|Tracheo]][[Bronchi and Bronchioles Inflammatory - Pathology#Infectious causes of bronchitis or bronchiolitis|bronchitis]], airway obstruction -> [[Lungs Ventilation - Pathology#Atelectasis (Collapse)|atelectasis]]
**[[Pleural Cavity & Membranes Inflammatory - Pathology|Pleura]] normal or covered with serous or serofibrinous exudate
**[[Pleural Cavity & Membranes Inflammatory - Pathology|Pleural cavity]] filled with excess fluid
**Lung lesions
***Clear demarcation of lesions in cranial and middle lobes
***[[Lungs Inflammatory - Pathology#Interstitial pneumonia|Interstitial pneumonia]]
*Histologically:
**Acute inflammation of mucosa of trachea and bronchi
*Zoonotic
*Circumstantial evidence of mutation from human strain
*Migrating [[Respiratory Parasitic Infections - Pathology#Ascaris suum|ascarids]] thought to precipitate the disease, reservoir of infection in earthworms containing infected lungworm larvae
[[Category:Orthomyxoviridae]][[Category:Pig]]
[[Category:Orthomyxoviridae]][[Category:Pig]]