Systematic Veterinary Virology

EASTERN AND WESTERN EQUINE ENCEPHALITIS

• The clinical signs of EEE and WEE can be identical. Following an incubation period of 5–14 days, clinical signs include fever, anorexia, and depression.
• In severe cases, the disease in horses progresses to hyperexcitability, blindness, ataxia, severe mental depression, recumbency, convulsions, and death.
• Horses infected with WEE do not have a significant viremia, where as significant viraemia is characteristic for EEE.