Mosquito-borne disease surveillance report: August 11 to 17, 2019 (Week 33)
Organization: Health Canada
Date published: 2019-08-27
As of surveillance week 33, ending on August 17, 2019, three human cases of West Nile virus (WNV) have been reported to the Public Health Agency of Canada (PHAC) (Table 1). Of these, one case was acquired outside of Canada prior to the start of the 2019 transmission season.
|Province||Clinical Cases||Total Footnote 1||Asymptomatic Infections Footnote 2||YTD Grand Total||Rate(per 100,000) Footnote 3|
Mosquito, Wild Bird & Equine Epidemiology
As of week 33, PHAC has been notified of 6,617 mosquito pools tested for WNV. Of these, 20 (0.30%) were positive in Quebec (3), Ontario (15) and Manitoba (2) (Table 2).
Nine of 33 dead wild birds have tested positive for WNV, by the Canadian Wildlife Health Cooperative (CWHC) in Ontario (6) and Quebec (3) (Table 3).
Since the start of this season, the Canadian Food Inspection Agency (CFIA) has reported one horse that tested positive for WNV in British Columbia (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
|Province Footnote 1||Positive Pools||Total Pools Tested||Percent Positive|
|Province||Wild Birds Footnote 1||Equine|
|Week 33||Year-to-Date Total||Week 33||Year-to-Date Total|
As of August 17, 2019, 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 2019 transmission season.
The CFIA has reported one horse tested positive for Eastern Equine Encephalitis virus (EEEV) in Ontario.
Provincial/Territorial & 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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