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Simcoe Muskoka District Health Unit warns of West Nile virus threat

September 24, 2026   ·   0 Comments

By Brian Lockhart

It may be starting to feel like fall, but mosquitoes are still active, and the risk of West Nile virus remains high.

The Simcoe Muskoka District Health Unit reminds residents to continue protecting themselves from mosquito bites. Mosquitoes remain active until the first hard frost.

This reminder follows reports of a human case of West Nile virus in Simcoe County. Five birds and one horse have also tested positive for the virus.

This indicates that West Nile virus is circulating in the community.

The Health Unit notes that more infections likely occur than are reported because many people do not become ill or seek medical attention.

West Nile virus circulates between birds and some mosquito species. People can become infected if bitten by a mosquito that has first bitten an infected bird.

Most people infected with West Nile virus do not get sick, but some can become seriously ill. Symptoms can include fever, muscle weakness, stiff neck, confusion, severe headache and sensitivity to light. Anyone with these symptoms should seek medical care.

The Health Unit monitors mosquitoes across Simcoe Muskoka through trapping, testing and larval checks during the summer.

The Health Unit recommends taking steps to prevent mosquito bites.

This includes using insect repellent, wearing light-coloured clothing and covering exposed skin, removing standing water around your home, and ensuring window and door screens are in good condition to stop mosquitoes from entering your home. 

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