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Santé Montréal

Eastern equine encephalitis

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Eastern equine encephalitis is caused by a virus (EEEV). The symptoms can range from a short bout of feverishness to a serious form that causes a life-threatening inflammation of the brain and meninges. The disease is rare in humans. People do not contract the disease following contact with a sick horse, but rather after being bitten by an infected mosquito. Wild birds are the natural hosts of the virus and mosquitoes become infected by biting them. 

  • No case in a human has been reported to date in Québec since this disease became reportable in 2003.
  • Eastern equine encephalitis reappeared in Québec in 2008 when an outbreak occurred in horses and emus in four Québec regions: Lanaudière, Montérégie, Estrie and Mauricie-Centre-du-Québec.
  • The virus is not transmitted directly from one person to another.
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When to Consult

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Protection and prevention

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Risk factors

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Help and Resources

Whom should you contact to get help? 

Call Info-Santé at 811 or see a doctor. 

Where can you find additional, credible information?

Public Health Agency of Canada
Centers for Disease Control and Prevention

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People at Risk

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Dernière mise à jour le : 2015.04.15