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        Friday, August 01, 2014
Saskatchewan! Healthy people. A healthy province.

Regardless of the West Nile virus (WNV) risk level for your health region, remember there is no such thing as "risk-free". If you can be bitten by a mosquito, you can contract West Nile or other mosquito-borne viruses. The main species that carries WNV in Saskatchewan is Culex tarsalis.

Take precautions when you are out in areas where mosquitoes are present. Protect yourself by covering up and wearing repellents or reducing the amount of time spent outdoors. Mosquitoes can be active at any time but are most active in the evening and throughout the night.

See Frequently Asked Questions for information on symptoms of West Nile Virus infection, when to seek medical attention, treatment and personal precautions against mosquitoes.

This Week's West Nile Virus Risk by ecological risk area* - July 31, 2014

Overall Summary


  • Late July and early August historically has been the highest risk period for WNV. 


  • The recent hot, humid weather with warm night-time temperatures has created ideal conditions for Culex tarsalis biting activity and transmission of the virus.


  • Culex tarsalis mosquitoes continue to increase in the southern portion of the province and have become increasingly capable of infecting people.


  • Based on information available to date transmission risk has increased in southern Saskatchewan.

WNV Risk


The mosquito species that carries WNV has not been detected. This does not mean risk is zero.

(yellow) The mosquito species that carries WNV has been detected in small numbers. There is a low probability of being bitten by an infected mosquito.
(orange) WNV mosquitoes have been detected in numbers where there is a moderate probability of being bitten by an infected mosquito.
(red) High numbers of WNV positive mosquitoes have been identified and are widespread. There is an increasing and high probability of being bitten by an infected mosquito.
West Nile Virus Risk Map 

* Ecological Risk Areas:

Mixed-Grass Prairie
(Sun Country,
Regina Qu'Appelle,
Five Hills, Cypress, Heartland
Health Regions)

Moist Mixed-Grass Prairie 
(Sunrise, Saskatoon,
Prairie North
Health Regions)

Boreal Transition
(Prince Albert
Parkland, Kelsey Trail
Health Regions)

Boreal Forest
(Athabasca, Mamawetan Churchill
River, Keewatin Yatthé
Health Regions) 

For a complete description of the criteria used for determining weekly risk, definitions of accumulated degree days, mosquito pools and other WNV risk indicators, 2014 seasonal surveillance results, and general information on WNV prevention see the links below.

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