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