Weekly West Nile Virus Update

September 15, 2017

Adult mosquito surveillance conducted during the week of September 3, 2017 showed a continued decrease in Culex tarsalis numbers. No additional WNV positive indicators (i.e. mosquito pools, human cases) were detected. WNV positive surveillance indicators have been identified in all four health regions in southern Manitoba this season.

Preliminary data for the week of September 10, 2017 shows a further decrease in Culex tarsalis numbers.

At present the risk of WNV exposure is minimal, however it is not zero. Individuals are still encouraged to adopt personal protection measures, particularly on warm days, (see below) to minimize their risk of WNV exposure. These measures should be adopted earlier in the evening as Culex tarsalis will become active earlier with the shortening days.

Manitobans are encouraged to reduce the risk of mosquito bites and exposure to WNV by:

  • reducing the amount of time spent outdoors during peak mosquito hours between dusk and dawn;
  • using appropriate mosquito repellent;
  • wearing light-coloured, loose-fitting clothing with long sleeves and pant legs, and
  • maintaining door and window screens so they fit tightly and are free of holes. 

More information about West Nile virus, including weekly average trap counts of Culex tarsalis mosquitoes, fact sheets, posters and information for municipalities and health-care providers, is available on this website.

Manitobans can also contact Health Links—Info Santé at 204-788-8200 or at 1-888-315-9257 (toll-free) for more information.


For WNV health concerns, contact your doctor or call:

Health Links - Info Santé
204-788-8200
(Winnipeg) or toll-free 1-888-315-9257