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West Nile virus
Fast Facts
- West Nile virus first appeared in Ontario in 2001.
- The virus is transmitted by mosquitoes that become infected by feeding on an infected bird.
- Research indicates that four out of five people bitten by an infected mosquito do not show any symptoms.
- Of those who show symptoms, most will experience mild illness
including fever, headache, body ache, nausea, vomiting and rash on chest, stomach or back.
- Only about one in 150 people infected will experience serious symptoms including high fever, severe headache, muscle weakness, stiff neck, confusion, tremors, numbness and sudden sensitivity to light.
- Symptoms usually develop between two and 15 days after being bitten by an infected mosquito.
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