Mosquito-borne disease surveillance report: July 28 to August 3, 2019 (Week 31)

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Organization: Health Canada
Date published: 2019-08-13
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Year-to-Date Snapshot - Text Equivalent
Between January 1, 2019 and August 3, 2019, one probable human cases associated with West Nile virus have been reported to the Public Health Agency of Canada. Seven WNV-positive birds and three WNV-positive mosquito pools have been reported to date. No WNV-positive horses have been reported.
West Nile
Human Epidemiology
As of surveillance week 31, ending on August 3, 2019, one probable human case of West Nile virus (WNV) in Ontario has been reported to the Public Health Agency of Canada (PHAC) (Table 1).
Province | Clinical Cases | Total Footnote 1 | Asymptomatic Infections Footnote 2 | YTD Grand Total | Rate(per 100,000) Footnote 3 | ||
---|---|---|---|---|---|---|---|
Neurological | Non-neurological | Unclassified | |||||
British Columbia | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Alberta | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Saskatchewan | 0 | - | - | 0 | 0 | 0 | 0 |
Manitoba | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Ontario | 0 | 0 | 1 | 1 | 0 | 1 | 0 |
Québec | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Maritime Provinces | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Territories | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Total | 0 [0%] | 0 [0%] | 1 [100%] | 1 [100%] | 0 | 1 | 0 |
|
Mosquito, Wild Bird & Equine Epidemiology
As of week 31, PHAC has been notified of 3, 775 mosquito pools tested for WNV. Of these, three were positive: two in Ontario and one in Manitoba (Table 2).
Seven of 26 dead wild birds have tested positive for WNV, by the Canadian Wildlife Health Cooperative (CWHC): four in Ontario and three in Quebec (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 1 - Text Equivalent
Between January 1, 2019 and August 3, 2019, one probable human cases associated with West Nile virus was reported to PHAC. A total of seven birds and 0.08% of mosquito pools have tested positive for WNV in Canada and reported to PHAC.
Figure1 - 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 |
---|---|---|---|
Saskatchewan | 0 | 71 | 0.00 % |
Manitoba | 1 | 701 | 0.14 % |
Ontario | 2 | 2176 | 0.09 % |
Québec | 0 | 827 | 0.00 % |
Total | 3 | 3775 | 0.08 % |
|
Province | Wild Birds Footnote 1 | Equine | ||
---|---|---|---|---|
Week 31 | Year-to-Date Total | Week 31 | Year-to-Date Total | |
British Columbia | 0 | 0 | 0 | 0 |
Alberta | 0 | 0 | 0 | 0 |
Saskatchewan | 0 | 0 | 0 | 0 |
Manitoba | 0 | 0 | 0 | 0 |
Ontario | 0 | 4 | 0 | 0 |
Québec | 1 | 3 | 0 | 0 |
Maritime Provinces | 0 | 0 | 0 | 0 |
Territories | 0 | 0 | 0 | 0 |
Total | 1 | 7 | 0 | 0 |
|
California Serogroup
As of August 3, 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 not reported any horses testing positive for Eastern Equine Encephalitis virus (EEEV) in Canada.
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:
Provincial
Notes
Thank you to all our partners for participating in the National WNV/MBD surveillance program.
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