Clinical Signs

Outbreaks of equine influenza spread quickly. When unprotected horses are exposed to the equine influenza virus, they generally will develop clinical signs of disease within 1 to 5 days. Clinical signs may include:

• A Rapid Rise in Temperature
  (possibly as high as 105° F)
• Loss of Appetite
• Muscle Soreness
• Depression
• Nasal Discharge (thin and watery at first changing to a thick discharge after several days)
• Dry Cough

The clinical signs of equine influenza are similar to other respiratory diseases, such as equine rhinopneumonitis and viral arteritis. The best way to confirm equine influenza is with laboratory testing.