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City of Toronto Media Relations has issued the following:
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News Release
July 16, 2024

Toronto Public Health confirms first mosquitos to test positive for West Nile virus in 2024


Toronto Public Health (TPH) has confirmed that a batch of mosquitoes collected in Toronto have tested positive for West Nile Virus (WNV). These mosquitoes are the first to test positive for WNV – an infection transmitted to people through the bite of an infected mosquito – in Toronto this year.

TPH conducts mosquito surveillance from mid-June to mid-September every year. Once a week, 22 mosquito traps are set across the city to collect mosquitoes that are then submitted to a laboratory for identification and grouped by the lab into batches to test for WNV.

While the risk of getting infected with WNV in Toronto is currently low, TPH advises residents to take these precautions to avoid bites from mosquitoes:
- Wear light-coloured clothing, long pants and long-sleeved shirts when outdoors.
- Apply insect repellent as directed by the manufacturer. Visit Health Canada's approved insect repellents webpage at https://www.canada.ca/en/health-canada/services/about-pesticides/insect-repellents.html. Take extra care at dusk and dawn by using repellent and covering up.
- Make sure homes have tight-fitting screens on windows and doors.
- Remove standing water from properties where mosquitoes can breed. Standing water includes any water that collects in items such as pool covers, buckets, planters, toys and waste containers.

WNV symptoms usually develop between two and 14 days after a person is bitten by an infected mosquito. Symptoms may include fever, headache, nausea, vomiting, body aches, skin rash and swollen lymph glands. Adults 50 years of age or older and individuals with compromised immune systems are at higher risk of severe illness. Anyone concerned about symptoms should contact their health care provider.

More information about WNV and ways to reduce the risk of being infected with WNV is available on the City’s West Nile virus webpage at www.toronto.ca/west-nile-virus/.

Toronto is home to more than three million people whose diversity and experiences make this great city Canada’s leading economic engine and one of the world’s most diverse and livable cities. As the fourth largest city in North America, Toronto is a global leader in technology, finance, film, music, culture, innovation and climate action, and consistently places at the top of international rankings due to investments championed by its government, residents and businesses. For more information visit www.toronto.ca or follow us on X at x.com/cityoftoronto, on Instagram at www.instagram.com/cityofto or on Facebook at www.facebook.com/cityofto.

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Media contact:
Media Relations, Toronto Public Health, TPHmedia@toronto.ca



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