Toronto confirms first mosquito batches with West Nile virus this year; health officials advise precautions but say overall infection risk remains low.
First Positive West Nile Cases Confirmed in 2025
Toronto Public Health (TPH) has reported that three mosquito batches collected within the city have tested positive for the West Nile virus—the first confirmed cases of the year. Officials say the risk of infection for residents remains low, provided that preventive measures are followed.
Surveillance and Timing
The virus was detected during routine weekly mosquito testing from 22 surveillance traps located across Toronto. These traps operate as part of the city’s annual mosquito surveillance program, which runs from mid-June through mid-September.
Transmission and Symptoms
West Nile virus is transmitted to humans through bites from infected mosquitos. Symptoms typically appear within two to 14 days and can include fever, headache, body aches, nausea, and skin rashes. Individuals over 50 or with weakened immune systems face a higher risk of severe complications.
Public Health Response
TPH emphasized that while the findings are noteworthy, the current level of risk to the public is low. However, residents are strongly encouraged to adopt preventive behaviors to reduce mosquito exposure.
Recommended Precautions
Health officials have outlined several protective steps for the public:
- Wear long sleeves and light-coloured clothing when outdoors.
- Use insect repellents approved by Health Canada.
- Avoid outdoor activity during dawn and dusk, when mosquitos are most active.
- Eliminate standing water around homes—such as in flower pots, gutters, and pool covers—to reduce breeding grounds.
Ongoing Monitoring
Toronto will continue testing mosquito populations weekly throughout the summer. Public health authorities remain vigilant and committed to updating the public if risks increase or further positive batches are identified.
West Nile virus activity varies from year to year, but awareness and early prevention are key to minimizing impact.
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