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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