Manitoban infected with West Nile Virus

Manitoba’s first probable human case of West Nile Virus of the season has been identified in the province’s Southern Health — Santé Sud Region.

First case of 2017 affects patient in Southern Health region

A adult mosquito is shown in the laboratory as the 2007 West Nile Virus program of the Middlesex-London Health Unit kicked off in Strathroy, Ontario Thursday May 10, 2007. A health region in Manitoba is reporting what appears to be the first human cases of West Nile virus in Canada this summer. (Dave Chidley/Canadian Press)

Manitoba's first probable human case of West Nile Virus of the season has been identified in the province's Southern Health — Santé Sud Region.

Manitoba Health, Seniors and Active Living says a male youth from the area experienced neurological symptoms and needed to be hospitalized after likely being exposed to the virus during the week of July 30.

West Nile is transmitted to humans in Manitoba mainly by the Culex tarsalis mosquito.

The province says adult mosquito surveillance conducted during the week of August 20 showed a slight increase in Culex tarsalis numbers compared to the previous week, and three additional West Nile Virus positive pools were detected, bringing the total for the season to 40.

Manitoba indicators

2017 2016 2015 Historical max

Infected mosquitoes collected


Human cases (total)


Positive surveillance indicators for West Nile Virus have been found in all four health regions in southern Manitoba this summer.

The province says preliminary trap numbers for the week of Aug. 27 has shown a significant decrease in Culex tarsalis numbers.

The risk of contracting West Nile Virus remains moderate, but will lessen as the days get shorter and the nights get cooler.