Mosquito-borne disease surveillance report: September 29 to October 12, 2019 (Week 40 & 41)
Organization: Public Health Agency of Canada
Date published: 2019-10-25
As of surveillance week 41, ending October 12, 2019, 29 human cases of West Nile virus (WNV) have been reported to the Public Health Agency of Canada (PHAC) (Table 1). Of these, four cases reported travel outside of Canada: British Columbia (1), Alberta (2) and Ontario (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 41, PHAC has been notified of 11,504 mosquito pools tested for WNV. Of these, 96 (0.83%) were positive in Quebec (19), Ontario (71) and Manitoba (6) (Table 2).
Since the start of this season, the Canadian Food Inspection Agency (CFIA) has reported six horses that tested positive for WNV in British Columbia (1), Saskatchewan (1), Alberta (2), Ontario (1) and Quebec (1) (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 40 & 41||Year-to-date total||Week 40 & 41||Year-to-date total|
As of September 30, 2019, 19 human cases/past exposures of California serogroup virus have been reported by the National Microbiology Laboratory across nine provinces in Canada. Of these, 14 were Jamestown Canyon, one was snowshoe hare virus and four were undetermined.
Eastern equine encephalitis
The CFIA has reported seven horses that tested positive for Eastern Equine Encephalitis virus (EEEV) in Ontario. In addition one mosquito pool tested positive for EEEV in Ontario (Windsor-Essex County Health Unit). No human cases of EEEV have been reported to PHAC since the beginning of the 2019 transmission season.
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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