Equine Rhinopneumonitis
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- Causative agent: equine herpesvirus type 1 and type 4
- Primary viral lesions in nasal mucosa and lungs
- Mild, transient bronchointerstitial pneumonia
- Latent infection acting as a reservoir
- Sites of latency: bronchial lymph nodes and trigeminal ganglia
- Replicates in upper respiratory tract epithelium
- Disseminated to lower respiratory tract
- Transported to other organs in T-lymphocytes - viraemia up to 3 weeks
- Vasculitis, abortion
- May be accompanied by secondary bacterial infection