Mosquito-borne disease surveillance report: August 16 to August 29, 2020 (Week 34 and 35)

Download the alternative format
(PDF format, 1.10 Mb, 4 pages)
Organization: Public Health Agency of Canada
Date published: 2020-09-15
Related topics

Year-to-date snapshot - Text equivalent
Between January 1 and August 29, 2020, twenty-two human cases of West Nile virus in Canada have been reported to the Public Health Agency of Canada (PHAC). Eleven WNV-positive birds, and 164 WNV-positive mosquito pools have also been reported.

Figure 1 - Text equivalent
Between January 1 and August 29, 2020, twenty-two human cases associated with West Nile virus acquired in Canada were reported to PHAC. Eleven positive birds have also been reported.
West Nile
Human epidemiology
As of surveillance week 35, ending on August 29, 2020, twenty-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 | ||
---|---|---|---|---|---|---|---|
Neurological | Non-neurological | Unclassified | |||||
Ontario | 1 | 6 | 5 | 12 | 1 | 13 | 0.09 |
Quebec | 4 | 0 | 2 | 6 | 3 | 9 | 0.1 |
Total | 5 | 6 | 7 | 18 | 4 | 22 | 0.06 |
|
Mosquito, wild bird and equine epidemiology
As of week 34 and 35, PHAC has been notified of 12926 mosquito pools tested for WNV in Canada. Of these, there have been five WNV-positive mosquito pools identified in Manitoba, 147 in Ontario, and twelve in Québec (Table 2).
Eleven dead wild birds have tested positive for WNV, by the Canadian Wildlife Health Cooperative five in Ontario and sixin Québec (Table 3).
Since the start of this season, the Canadian Food Inspection Agency (CFIA) has reported one equine that tested positive for WNV (Table 3).



Figure 2 - Text equivalent
Between January 1 and August 29, 2020, twenty-two human cases associated with West Nile virus acquired in Canada were reported to PHAC. A total of eleven birds and 1.27 % of mosquito pools have tested positive for WNV in Canada and reported to PHAC.
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 |
---|---|---|---|
Saskatchewan | 0 | 71 | 0.00 % |
Manitoba | 5Footnote * | 1236 | 0.40 % |
Ontario | 147 | 10456 | 1.41 % |
Québec | 12 | 1163 | 1.03 % |
Total | 164 | 12926 | 1.27 % |
|
Province | Wild birds Footnote 1 | Equine | ||
---|---|---|---|---|
British Columbia | 0 | 0 | ||
Alberta | 0 | 0 | ||
Saskatchewan | 0 | 1 | ||
Manitoba | 0 | 0 | ||
Ontario | 5 | 0 | ||
Quebec | 6 | 0 | ||
Maritime provinces | 0 | 0 | ||
Territories | 0 | 0 | ||
Total | 11 | 1 | ||
|
California serogroup
As of August 29, 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 one horse 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:
Provincial
Notes
Thank you to all our partners for participating in the National WNV/MBD surveillance program.
Page details
- Date modified: