Weekly West Nile Virus Update


September 11, 2020

Adult mosquito surveillance conducted during the week of August 30-September 5, 2020 detected Culex tarsalis activity in ten (10) of twenty-one (21) sentinel communities. There were no (0) new WNV infected mosquito pool have been found as part of Manitoba Health’s West Nile virus surveillance program. This leaves the total of three (3) positive mosquito pools: two (2) in Prairie Mountain Health and one (1) in the Winnipeg Regional Health Authority.

Surveillance has not detected any additional positive WNV surveillance indicators (e.g. human cases, birds or horses) anywhere in the province. There are currently no orders for adult mosquito control related to West Nile virus.

Mosquito activity for Culex tarsalis is decreasing now that cooler weather is settling in. While mosquito activity is starting to wane, it is important to remember that warm temperatures, in particular in the late afternoon and early evening are conducive to Culex tarsalis activity

While the risk of West Nile virus is low, Manitobans should still consider taking appropriate precautions to reduce their risk of mosquito bites and WNV exposure.

Protective measures include:

  • 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.

For WNV health concerns, contact your doctor or call:

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