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

40 38 28 931

Human cases (total)

1 20 4 495

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.