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Swine Influenza

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VIRUSES
INFLUENZA



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
  • For more, see here

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
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