Page 640 - The Veterinary Care of the Horse
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Figure 15.3 The nasal discharge may become thick and yellow or green
The disease usually lasts for 1–3 weeks. Vaccinated horses may be affected, but the illness is
generally less severe.
When to call the vet
If you suspect your horse has equine influenza you should call your vet immediately. Steps
can then be taken to limit the spread of the disease.
Diagnosis
The diagnosis is made on:
• the clinical signs
• isolation of the virus from nasopharyngeal swabs
• a number of other laboratory tests which identify the virus
• rising antibody levels in blood (serum) samples taken early in the course of the disease
and 2–3 weeks later
