Weekly West Nile Virus Update


August 23, 2019

During the week of August 11-17, 2019 adult mosquito surveillance detected one additional WNV infected mosquito pool. The pool was collected from the community of Oakbank. To date, three WNV infected mosquito pools have been detected this season. There have been no additional positive WNV surveillance indicators (e.g. human cases, birds or horses) identified anywhere in the province.

Adult mosquito surveillance conducted during the week of August 11-17, 2019 showed a notable decrease in Culex tarsalis mosquito activity. While Culex tarsalis were collected in all twenty-eight sentinel communities, numbers declined in each. Numbers were highest in the Prairie Mountain Health Region.

Although WNV activity has been limited this season, we are in the historical high-risk period and as such, Manitobans should continue take appropriate precautions to reduce their risk of mosquito bites and WNV exposure. More than 40% of all WNV cases reported since 2003, noted exposure between mid-to-late August.

While enjoying warm weather activities, Manitobans can protect themselves 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. 

Manitobans can also reduce the number of mosquitoes around their home by eliminating standing water.  To reduce standing water:

  • clean eaves troughs and regularly empty bird baths and other items that might collect water,
  • ensure rain barrels are covered with mosquito screening or are tightly sealed around the downspout,
  • clear yards of old tires or other items that collect water, and
  • improve landscaping to prevent standing water around the home.

For WNV health concerns, contact your doctor or call:

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