Contagious

Headshot portrait of a horse in a barn
What to do for a horse with a runny nose
If your horse has nasal discharge, call your veterinarian. Then take steps to contain contagion and look for source of the trouble.
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Two Washington State farms quarantined due to equine influenza virus
The highly contagious viral disease is spread via airborne droplets exhaled by infected horses or contact with contaminated surfaces.