Toronto Public Health conducts mosquito surveillance from mid-June until mid-September every year. Once a week, forty mosquito traps are set across the city and the mosquitoes captured and tested for West Nile virus (WNV). In 2017, adult mosquito surveillance was conducted from June 19 to September 11th.

In 2017, 62 mosquito pools tested positive for WNV. Adult mosquito surveillance is now complete for 2017, and will resume in spring 2018.

 

NOTE: The reports on this page are not compatible with screen reading software.
If you require an alternate format to access information, or assistance in interpreting the information

contained in these reports, please contact the Communicable Disease Surveillance Unit by phone (416-392-7411) or email (cdsu@toronto.ca) during business hours (Monday to Friday, 8:30 a.m. to 4:30 p.m.).

Human Case Surveillance

Confirmed and suspected human cases of WNV illness for Toronto residents are reportable to Toronto’s Medical Officer of Health, and are investigated by Toronto Public Health.

As of October 25, 2017, 28 (25 confirmed and three probable) human WNV cases have been reported to Toronto Public Health.

WNV Surveillance Bulletins describe human cases of WNV illness that have been reported to Toronto Public Health, and provide updates on mosquito surveillance activities in Toronto. These bulletins are posted to update health professionals and the public health community with comprehensive epidemiologic information on WNV illness in Toronto.  Bulletins are now complete for 2017. The reports will resume in 2018 should sufficient cases be reported.

 

West Nile Virus Reports

If you require assistance in accessing or interpreting communicable disease surveillance information or data, please contact the Communicable Disease Surveillance Unit by phone (416-392-7411) or email (cdsu@toronto.ca) during business hours (Monday to Friday, 8:30 a.m. to 4:30 p.m.).