West Nile Virus is Here, But Don’t Let It Stop You

West Nile Virus Confirmed in Canada for 2017

The first positive case of West Nile virus in 2017 has been confirmed in Canada. The Ontario region of the CWHC received three dead American Crows from a member of the public in Campbellville, Ontario, which all tested positive for the virus.

These positive crows signify the first confirmed detection of West Nile  virus activity in Canada in 2017. So far this year (as of June 30),  there have been no confirmed human cases or positive mosquito pools.

Photo credit: DM Jefferson


Tips to Prevent Infection

Mosquito bites are the primary source of infection of West Nile Virus, so prevention of mosquito bites is your best defense. Here are some prevention tips from the Public Health Agency of Canada and the Centers for Disease Control and Prevention:

  • Use mosquito repellent – There are many products available to help repel mosquitoes. The Center for Disease Control (CDC) recommends those containing “DEET, picaridin, IR3535, and some oil of lemon eucalyptus and para-menthane-diol products”.


  • Cover exposed skin – When possible, wear long sleeve tops, pants and socks to minimize exposed skin from mosquitoes. Be aware that mosquitoes can potentially bite through thin layers of clothes.


  • Minimize exposure during dusk and dawn – Mosquitoes are most active during dusk and dawn. If possible, avoid the outdoors. Otherwise, be sure to consider the other tips listed to prevent bites.


  • Eliminate standing water – Be sure to eliminate any standing water on your property. This will help to minimize the number breeding sites for mosquitoes.

Image credit: Center for Disease Control and Prevention


What To Do If You Find Dead Birds

The corvid family of birds, which includes blue jays, crows and ravens, are highly susceptible to West Nile virus. They have a very high likelihood of dying from the virus if infected. For this reason, these species are the main focus of West Nile virus detection in birds.

If you find dead corvids on your property and you are concerned about West Nile virus, you can contact your local region of the CWHC for more information.


Contributed by David Cristo, Communications Coordinator for CWHC Ontario/Nunavut.


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