Mosquito-borne disease surveillance report: July 26 to August 15, 2020 (Week 31, 32 and 33)
Organization: Public Health Agency of Canada
Date published: 2020-08-28
As of surveillance week 33, ending on August 15, 2020, two 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 33, PHAC has been notified of 11764 mosquito pools tested for WNV in Canada. Of these, there have been 98 WNV-positive mosquito pools identified in Ontario and one in Québec (Table 2).
Eight dead wild birds have tested positive for WNV, by the Canadian Wildlife Health Cooperative five in Ontario and three in Québec (Table 3).
Since the start of this season, the Canadian Food Inspection Agency (CFIA) has not reported any domestic animals that tested positive for WNV (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||0Footnote *||1027||0.00 %|
|Québec||1||2339||< 1 %|
|Total||99||11764||< 1 %|
|Province||Wild birds Footnote 1||Equine|
As of August 15, 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 not reported any horses testing positive for Eastern Equine Encephalitis virus (EEEV) in Canada.
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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