Ottawa public health officials have confirmed the presence of West Nile virus in mosquito samples collected in the city, according to a report from CityNews Ottawa published Sunday.
The announcement marks the first positive detection of the virus in the capital this season. CityNews Ottawa did not specify the exact location where the infected mosquitoes were found or the date of collection, but the confirmation triggers standard public health warnings for residents to guard against bites.
The Ottawa finding is part of a broader trend across Ontario. Separate reports from CBC, CHCH, and DurhamRegion.com indicate that mosquitoes in Hamilton, Niagara, and Oshawa have also tested positive for West Nile virus in recent days. Additionally, Inside Halton reports that mosquito activity is expected to surge across the province over the long weekend, which could elevate the risk of human exposure.
West Nile virus is transmitted to people through the bite of an infected mosquito. While most infected individuals experience no symptoms or only mild flu-like illness, severe cases can lead to neurological complications, particularly in older adults or those with weakened immune systems.
Health officials typically advise residents to eliminate standing water around homes—where mosquitoes breed—and to use insect repellent containing DEET or other approved ingredients. Wearing long sleeves and pants during dawn and dusk, when mosquitoes are most active, is also recommended.
With multiple regions reporting positive samples and a forecasted increase in mosquito numbers, Ontario residents are being urged to remain vigilant. The next development to watch is whether any human cases of West Nile virus are confirmed in the province, which would signal a further escalation of the seasonal risk.
