About Western Equine Encephalitis

On this page:
Fact Sheet
Transmission
Prevention
Signs and symptoms

Fact Sheet

Transmission

Prevention

  • Preventing Mosquito-Transmitted Diseases
    Learn how to minimize your risk to western equine encephalitis and other diseases transmitted by mosquitoes.

  • There is a vaccine available for horses to prevent western equine encephalitis. Please contact your veterinarian for vaccine recommendations.

Signs and symptoms

  • Most people infected with western equine encephalitis virus will have either no symptoms or a very mild illness.

  • A small percentage of people, especially infants and elderly people to a lesser extent, may develop encephalitis (inflammation of the brain).

  • Approximately 5-15% of these encephalitis cases are fatal, and about 50% of surviving infants will have permanent brain damage.

  • Most of the severe human cases begin with a sudden onset of fever, headache, stiff neck, vomiting, and lethargy.

  • Within two to four days, the illness may progress into disorientation, irritability, seizures, and coma.

  • There is no treatment for WEE other than supportive care until the acute phase of the illness is over.




Updated Wednesday, November 17, 2010 at 12:36PM