Toronto Public Health Reports First Mosquitoes Testing Positive for West Nile Virus in 2026

📅 Today 🏷️ City of Toronto Municipality

Toronto Public Health has confirmed the first batch of mosquitoes testing positive for West Nile virus this year, urging residents to take preventive measures against mosquito bites.

On July 17, 2026, Toronto Public Health (TPH) announced that a batch of mosquitoes in the city has tested positive for West Nile virus, marking the first confirmed case of the virus in mosquitoes this year. West Nile virus is an illness that can be transmitted to humans through the bite of an infected mosquito. TPH conducts mosquito surveillance annually, beginning in mid-June and continuing until mid-September. During this period, 22 traps are set weekly across various locations in Toronto to capture mosquitoes for identification and laboratory testing.
Although public health officials indicate that the risk of contracting West Nile virus in Toronto remains low, they recommend that residents take specific precautions to mitigate the risk of mosquito bites. These guidelines include wearing light-colored clothing, long pants, and long-sleeved shirts when outdoors. Additionally, residents are advised to apply insect repellent approved by Health Canada according to the instructions provided by manufacturers.
Particular attention should be paid during peak mosquito activity times, which are typically at dusk and dawn. During these hours, it is advisable to use repellent and wear appropriate clothing. Furthermore, ensuring that windows and doors are fitted with tight screens and are free from holes can help prevent mosquito entry into homes. TPH also encourages residents to eliminate standing water from their properties, as stagnant water serves as a breeding ground for mosquitoes. This includes any water that may accumulate in items like pool covers, buckets, planters, toys, and waste containers.
Symptoms of West Nile virus can manifest between two to fourteen days following a bite from an infected mosquito. Common symptoms include fever, headache, nausea, vomiting, body aches, skin rashes, and swollen lymph glands. It is particularly important for adults aged 50 and older, as well as individuals with weakened immune systems, to be vigilant, as they are at a higher risk of experiencing severe illness. Anyone who develops symptoms or has concerns is urged to reach out to their healthcare provider for guidance.
For further information regarding West Nile virus and preventive measures, residents can visit the City of Toronto’s dedicated webpage on the subject. Toronto, known for its vibrant population of over three million residents, stands as a leading economic hub in Canada and one of the most diverse and livable cities globally. The city is not only an Official Host City for the upcoming FIFA World Cup 2026™ but also ranks highly in international standings for technology, finance, culture, and climate action, thanks to the collaborative efforts of its government, residents, and businesses.

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