Mosquito-borne diseases surveillance report: August 2 to August 15, 2021 (Week 31 to 32)
Organization: Public Health Agency of Canada
Date published: 2021-08-30
As of surveillance week 32, ending on August 15, 2021, one human case of West Nile virus (WNV) has been reported to the Public Health Agency of Canada (PHAC) (Table 1).
|Province||Clinical cases||Total of clinical cases Footnote 1||Asymptomatic infections Footnote 2||YTD grand total||Rate (per 100,000) Footnote 3|
Mosquito, wild bird and equine epidemiology
As of week 32, PHAC has been notified of 10,683 mosquito pools tested for WNV in Canada. Of these, there have been 2 WNV-positive mosquito pools identified in Québec, 30 Ontario, 29 in Manitoba and 6 in Saskatchewan (Table 2).
Seven wild birds have tested positive WNV by the by the Canadian Wildlife Health Cooperative, 4 in Québec and 3 in Ontario (Table 3).
Since the start of this season, the Canadian Food Inspection Agency (CFIA) has identified one equine case that tested positive for WNV in Saskatchewan. Additionally, the province of Saskatchewan reported one more WNV positive equine case (Table 3).
Figure 2 - Legend
Human cases includes clinical cases and asymptomatic infection.
Episode week is based on symptom onset or best available date including: diagnosis, lab sample or date reported.
Episode week is based off date of death or best available date including: date found, submitted, or received.
|ProvinceFootnote 1||Positive pools||Total pools tested||Percent positive|
|Manitoba||29||925Footnote 2||3.14 %|
|Province||Wild birds Footnote 1||Equine|
As of August 15, 2021, no human exposures or cases of California serogroup virus have been reported by the National Microbiology Laboratory.
Eastern equine encephalitis
No human cases of Eastern Equine Encephalitis virus (EEEV) have been reported to PHAC since the beginning of the 2021 transmission season.
The CFIA has reported one horse case testing positive for EEEV in Ontario.
Provincial/territorial and international surveillance links
Data reported to PHAC is subject to change and may differ from provincial webpages due to reporting timelines. To obtain the latest arbovirus surveillance data, please refer to the following jurisdictional/regional webpages:
Thank you to all our partners for participating in the National WNV/MBD surveillance program.
Report a problem or mistake on this page
- Date modified: