Mosquito-borne disease surveillance report: August 30 to September 12, 2020 (Week 36 and 37)
Organization: Public Health Agency of Canada
Date published: 2020-10-09
As of surveillance week 37, ending on September 12, 2020, thirty-four human cases of West Nile virus (WNV) have 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 36 and 37, PHAC has been notified of 14,268 mosquito pools tested for WNV in Canada. Of these, there have been five WNV-positive mosquito pools identified in Manitoba, 166 in Ontario, and twelve in Québec (Table 2).
Twenty-six dead wild birds have tested positive for WNV, by the Canadian Wildlife Health Cooperative fourteen in Ontario and twelve in Québec (Table 3).
Since the start of this season, the Canadian Food Inspection Agency (CFIA) has identified five equine case that tested positive for WNV in two in Saskatchewan, one in Ontario, one in Quebec and one in Manitoba (Table 3).
Figure 2 footnotes
- Footnote 1
Human cases includes clinical cases and asymptomatic infection.
Return to footnote 1 referrer
- Footnote 2
Episode week is based on symptom onset or best available date including: diagnosis, lab sample or date reported.
Return to footnote 2 referrer
- Footnote 3
Episode week is based off date of death or best available date including: date found, submitted, or received.
Return to footnote 3 referrer
|ProvinceFootnote 1||Positive pools||Total pools tested||Percent positive|
|Manitoba||5Footnote *||1264||0.40 %|
|Province||Wild birds Footnote 1||Equine|
As of September 12, 2020, no human exposures or cases of California serogroup virus have been reported by the National Microbiology Laboratory.
Eastern equine encephalitis
No human cases of EEEV have been reported to PHAC since the beginning of the 2020 transmission season.
The CFIA has reported two horses testing positive for Eastern Equine Encephalitis virus (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.
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