Difference between revisions of "Swine Influenza"
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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 | ||
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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]] | ||
| + | *[[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 | ||
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[[Category:Orthomyxoviridae]][[Category:Pig]] | [[Category:Orthomyxoviridae]][[Category:Pig]] | ||
Revision as of 10:37, 22 May 2010
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This article is still under construction. |
Subtypes
- Avian-like H1 and human-like H3 strains vary in virulence
Pathogenesis
- Necrotising bronchiolitis with catarrhal pus
- Barking cough
- Interstitial pneumonia giving consolidation of the lungs and a 'meaty' appearance
- 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
Diagnosis
- Clinical pneumonia is always suspect
- Serology: retrospective diagnosis by HI
Control
- Isolation of premises
- All-in/all-out systems
- Vaccination is not licensed in the UK
- Caused by Orthomyxoviridae
- Rhinitis, may progress to pneumonia
- Clinical signs: pyrexia, lethargy, skin erythema, anorexia, severe cough and sneezing, dyspnoea, conjunctivitis, pregnant sows may abort
- Grossly:
- Tracheobronchitis, airway obstruction -> atelectasis
- Pleura normal or covered with serous or serofibrinous exudate
- Pleural cavity filled with excess fluid
- Lung lesions
- Clear demarcation of lesions in cranial and middle lobes
- Interstitial pneumonia
- Histologically:
- Acute inflammation of mucosa of trachea and bronchi
- Zoonotic
- Circumstantial evidence of mutation from human strain
- Migrating ascarids thought to precipitate the disease, reservoir of infection in earthworms containing infected lungworm larvae