West Nile virus is back. Where it’s been found, and what you should know – GLOBAL

July 23, 2025

West Nile virus has returned to Canada for another season, with detections in mosquitoes in multiple regions of Ontario in the past week, including in Toronto.

Niagara Region Public Health confirmed Tuesday that West Nile virus had been detected in mosquitoes in Welland, Ont., while Toronto and York Region reported their first positive cases in the insects late last week.

No human cases of the virus have been reported in Canada as of Wednesday, but that isn’t stopping health-care professionals from urging caution.

“Nobody wants to get bit by mosquitoes, whether or not they’re causing fever,” said Dr. Isaac Bogoch, an infectious diseases specialist at Toronto General Hospital.

What are the symptoms of West Nile virus?
West Nile virus first arrived in Canada in August 2002, according to Infection Prevention and Control Canada (IPAC).

Read more: https://globalnews.ca/news/11299962/west-nile-virus-back-where-what-to-know/