Weekly West Nile Virus Update


September 6, 2019

Adult mosquito surveillance conducted during the week of August 25 – 31, 2019 detected Culex tarsalis activity in all twenty (20) of the twenty-eight (28) sentinel communities. No additional WNV infected mosquito pools were detected. A total of seven (7) WNV positive mosquito pools have been collected this season. 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.

Preliminary trapping data for the week of September 1 - 7, 2019 (the final trapping week of 2019) shows a further decrease in Culex tarsalis numbers. Culex tarsalis activity was detected in one of the eleven (11) sentinel communities run during this week.

During this week traps were run in eleven (11) communities and Culex tarsalis were only detected in one of these.

Despite the cooler temperatures, Culex tarsalis may still be active on warmer evenings and in the afternoons of overcast days. 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