Mosquito-borne disease surveillance report: September 27 to October 24, 2020 (Week 40 to 43)
Organization: Public Health Agency of Canada
Date published: 2020-10-24
As of surveillance week 43, ending on October 24, 2020, eighty-six human cases of West Nile virus (WNV) have been reported to the Public Health Agency of Canada (PHAC) (Table 1). Of these, three are reported as deaths.
|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 43, PHAC has been notified of 15,945 mosquito pools tested for WNV in Canada. Of these, there have been five WNV-positive mosquito pools identified in Manitoba, 171 in Ontario, and twenty-two in Québec (Table 2).
Since the start of this season, the Canadian Food Inspection Agency (CFIA) has identified six equine cases that tested positive for WNV, one in Alberta, two in Saskatchewan, one in Ontario, one in Quebec and one in Manitoba (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||5Footnote *||1,264||0.40 %|
|Province||Wild birds Footnote 1||Equine|
As of October 24, 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 eight 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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