West Nile Virus national surveillance report: August 12 to 18, 2018
Related Topics
West Nile Virus - Week 33 2018
Canada
- Human
During surveillance week 33, ending on August 18, 2018, the Public Health Agency of Canada was informed of three additional cases of West Nile virus (WNV): one in Alberta, one in Ontario and one in Québec.
As of week 33, a total of twelve clinical cases of WNV have been reported by the following four provinces: Alberta (1), Manitoba (3), Ontario (6), and Québec (2). Of these, five (42%) have been classified as WNV neurological syndrome, two (16%) as WNV non-neurological and five (42%) are unspecified. No deaths have been reported. In addition, six WNV asymptomatic infections have been reported: three in Manitoba, two in Ontario and one in Québec.
- Mosquito
To date (week 33), the PHAC has been notified of 11,601 mosquito pools tested for WNV: Saskatchewan (673), Manitoba (1,728), Ontario (8,196) and Québec (1,004). Of these, a total of 389 (3.35%) have tested positive for WNV: forty-four in Saskatchewan, 152 in Manitoba, 180 in Ontario, and thirteen in Québec.
- Wild Bird
-
To date (week 33), forty-eight out of eighty dead wild birds have tested positive for WNV by Canadian Wildlife Health Cooperative (CWHC) and Manitoba Agriculture: two in Saskatchewan, thirteen in Manitoba, nineteen in Ontario, and fourteen in Québec. In addition, four live birds in Québec have been tested positive for WNV by the University of Montréal.
- Equine
The Canadian Food Inspection Agency (CFIA) has reported seventeen horses with WNV infection in the following three provinces: Alberta (7), Saskatchewan (7), and Manitoba (3).
United States and U.S. territories
As of August 21, 231 human cases of WNV have been reported to the US Centers for Disease Control and Prevention (CDC). Of these, 133 (58%) were classified as neuroinvasive disease and ninety-eight (42%) as non-neuroinvasive disease. Eight deaths have been reported. In addition, forty-four presumptive viremic blood donors have been identified.
Europe and Neighboring Countries
As of August 16th, 401 human cases of West Nile fever have been reported to the European Centre for Disease Prevention and Control. Twenty deaths have been reported.
Weekly updates: 2018 West Nile fever transmission season
Other Mosquito-borne Diseases in Canada - Week 33 2018
- Eastern Equine Encephalitis virus
The CFIA has reported four horses testing positive for Eastern Equine Encephalitis virus (EEEV) in Ontario. No human cases of EEEV have been reported to the PHAC since the 2018 season.
- California Serogroup virus
-
Since May 1, 2018, fifteen human cases/exposures of California serogroup virus have been reported by the National Microbiology Laboratory in the following five provinces: Alberta (1), Saskatchewan (2), Ontario (4), Quebec (7) and New Brunswick (1). Of the 15 cases, nine were further typed as Jamestown Canyon virus, and two as Snowshoe hare virus
Figure and tables
Figure 2 note ±: WNV clinical cases and asymptomatic infections are grouped by report week, based on episode date. Episode date could include one of the following: onset date, diagnosis date, lab sample date or reporting date.
Figure 2 - Text description
As of week 33, ending August 18, 2018, there are fifteen human clinical cases and asymptomatic infections associated with WNV in Canada.
Province / Territory | Report Weekfigure 2 table note ± | Total | |||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | ||
Alberta | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 |
Manitoba | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 2 | 2 | 0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 6 |
Ontario | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 | 2 | 1 | 0 | 1 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 8 |
Quebec | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 1 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 3 |
Total | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 3 | 3 | 5 | 2 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 18 |
'-' = Not available. Figure 2 table notes
|
Figure 3 note *: WNV clinical cases and asymptomatic infections are grouped by report week, based on episode date. Episode date could include one of the following: onset date, diagnosis date, lab sample date or reporting date.
Figure 3 - Text description
Year | Report Weekfigure 3 table note * | Total | |||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | ||
2018 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 3 | 3 | 5 | 2 | 3 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 18 |
2017 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 1 | 7 | 3 | 8 | 10 | 26 | 31 | 31 | 27 | 13 | 16 | 7 | 8 | 4 | 1 | 1 | 3 | 0 | 0 | 0 | 200 |
2016 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 5 | 5 | 14 | 11 | 16 | 12 | 9 | 6 | 15 | 5 | 0 | 0 | 3 | 1 | 0 | 1 | 0 | 105 |
2014 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 4 | 3 | 5 | 6 | 1 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 22 |
2012 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 3 | 5 | 11 | 16 | 27 | 53 | 63 | 57 | 43 | 43 | 45 | 24 | 30 | 14 | 9 | 5 | 1 | 0 | 0 | 0 | 0 | 450 |
2007 | 0 | 0 | 0 | 2 | 2 | 3 | 4 | 11 | 35 | 36 | 72 | 139 | 424 | 471 | 443 | 287 | 182 | 116 | 71 | 30 | 18 | 10 | 11 | 5 | 4 | 2 | 0 | 0 | 2,378 |
2003 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 5 | 11 | 9 | 27 | 66 | 249 | 323 | 324 | 178 | 107 | 82 | 37 | 14 | 8 | 4 | 3 | 0 | 0 | 0 | 1,450 |
'-' = Not available. Figure 3 table notes
|
Province/Territory | Clinical Cases | Total clinical casestable 1 note 1 | Total travel-related casestable 1 note 2 | Total asymptomatic infectionstable 1 note 3 | ||
---|---|---|---|---|---|---|
Neurological syndrome | Non-neurological syndrome | Unclassified/ Unspecified | ||||
Week 33: August 12 to August 18, 2018 | ||||||
Newfoundland and Labrador | 0 | 0 | 0 | 0 | 0 | 0 |
Prince Edward Island | 0 | 0 | 0 | 0 | 0 | 0 |
Nova Scotia | 0 | 0 | 0 | 0 | 0 | 0 |
New Brunswick | 0 | 0 | 0 | 0 | 0 | 0 |
Québec | 0 | 0 | 0 | 0 | 0 | 0 |
Ontario | 0 | 0 | 1 | 1 | 0 | 1 |
Manitoba | 0 | 0 | 0 | 0 | 0 | 0 |
Saskatchewantable 1 note 4 | 0 | - | - | - | - | - |
Alberta | 0 | 0 | 1 | 1 | 0 | 0 |
British Columbia | 0 | 0 | 0 | 0 | 0 | 0 |
Yukon Territory | 0 | 0 | 0 | 0 | 0 | 0 |
Northwest Territory | 0 | 0 | 0 | 0 | 0 | 0 |
Nunavut | 0 | 0 | 0 | 0 | 0 | 0 |
Total | 0 | 0 | 2 | 2 | 0 | 1 |
Year to date: January 1 to August 18, 2018 | ||||||
Newfoundland and Labrador | 0 | 0 | 0 | 0 | 0 | 0 |
Prince Edward Island | 0 | 0 | 0 | 0 | 0 | 0 |
Nova Scotia | 0 | 0 | 0 | 0 | 0 | 0 |
New Brunswick | 0 | 0 | 0 | 0 | 0 | 0 |
Québec | 2 | 0 | 0 | 2 | 0 | 1 |
Ontario | 2 | 1 | 3 | 6 | 2 | 2 |
Manitoba | 1 | 1 | 1 | 3 | 0 | 3 |
Saskatchewantable 1 note 4 | 0 | - | - | - | - | - |
Alberta | 0 | 0 | 0 | 0 | 0 | 0 |
British Columbia | 0 | 0 | 0 | 0 | 0 | 0 |
Yukon Territory | 0 | 0 | 0 | 0 | 0 | 0 |
Northwest Territory | 0 | 0 | 0 | 0 | 0 | 0 |
Nunavut | 0 | 0 | 0 | 0 | 0 | 0 |
Total | 5 | 2 | 5 | 12 | 2 | 6 |
'-' = Not available. Table 1 notes
|
Province / Territory | Number of positive mosquito pools | Number of mosquito pools tested | Percentage of positive mosquito pools (%) |
---|---|---|---|
Saskatchewan | 44 | 673 | 6.54 |
Manitoba | 152 | 1,728 | 8.80 |
Ontario | 180 | 8,196 | 2.20 |
Québec | 13 | 1,004 | 1.29 |
Total | 389 | 11,601 | 3.35 |
Table 2 notes
|
Province | Report Week | Total | ||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | ||
Saskatchewan | 0 | 15 | 18 | 17 | 45 | 55 | 90 | 104 | 96 | 106 | 62 | 65 | - | - | - | - | - | - | - | 673 |
Manitoba | 15 | 39 | 89 | 107 | 124 | 122 | 241 | 240 | 247 | 169 | 172 | 163 | - | - | - | - | - | - | - | 1,728 |
Ontario | 0 | 0 | 0 | 0 | 842 | 955 | 1,024 | 963 | 1,073 | 1,059 | 1,156 | 1,124 | - | - | - | - | - | - | - | 8,196 |
Québec | 0 | 69 | 77 | 105 | 105 | 108 | 109 | 109 | 110 | 99 | 113 | - | - | - | - | - | - | - | - | 1,004 |
Total | 15 | 123 | 184 | 229 | 1,116 | 1,240 | 1,464 | 1,416 | 1,526 | 1,433 | 1,503 | 1,352 | - | - | - | - | - | - | - | 11,601 |
'-' = Not available. Table 3 notes
|
Figure 4 notes
- Figure 4 note *
Not all provinces conduct dead wild bird surveillance as part of their respective WNV surveillance program. However, WNV positive dead wild birds may be identified through the National Wildlife Disease Surveillance Program, CWHC.
Figure 4 - Text description
As of week 33, ending August 18, 2018, there are forty-eight WNV cases in birds, in Canada.
Province | Jun | Jul | Aug | Sept | Oct | Nov | Total | |||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | ||
Québec | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 1 | 0 | 4 | 7 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 14 |
Ontario | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 5 | 1 | 3 | 5 | 4 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 19 |
Manitoba | 0 | 0 | 3 | 0 | 0 | 0 | 0 | 0 | 7 | 0 | 3 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 13 |
Saskatchewan | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 2 |
Total | 0 | 0 | 3 | 0 | 0 | 1 | 0 | 7 | 11 | 3 | 12 | 11 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 48 |
'-' = Not available. |
Figure 5 notes
- Figure 5 note *
Not all provinces conduct dead wild bird surveillance as part of their respective WNV surveillance program. However, WNV positive dead wild birds may be identified through the National Wildlife Disease Surveillance Program, CWHC.
Figure 5 - Text description
Jun | Jul | Aug | Sept | Oct | Nov | ||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | ||
2013 | Percentage positive | 0 | 0 | 0 | 0 | 20 | 0 | 0 | 56 | 20 | 45 | 47 | 38 | 38 | 75 | 69 | 67 | 60 | 67 | 0 | 50 | 100 | 0 | 17 | 0 | 0 | 0 |
2014 | Percentage positive | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 15 | 20 | 29 | 31 | 0 | 27 | 75 | 0 | 20 | 0 | 50 | 0 | 0 | 0 | 0 | 0 |
2015 | Percentage positive | 0 | 0 | 100 | 0 | 0 | 0 | 100 | 83 | 60 | 73 | 0 | 25 | 67 | 83 | 57 | 50 | 80 | 67 | 0 | 21 | 0 | 0 | 0 | 0 | 50 | 0 |
2016 | Percentage positive | 0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
33 |
50 |
23 |
25 |
80 |
43 |
43 |
20 |
36 |
0 |
80 |
0 |
0 |
0 |
0 |
0 |
2017 | Percentage positive | 0 |
0 |
0 |
100 |
25 |
50 |
100 |
33 |
87 |
86 |
53 |
77 |
74 |
87 |
80 |
71 |
57 |
31 |
43 |
33 |
20 |
50 |
50 |
0 |
0 |
0 |
2018 | Percentage positive | 0 |
0 |
100 |
0 |
0 |
50 | 0 | 78 | 85 | 100 | 75 | 46 | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
2018 | Number positive | 0 |
0 |
3 |
0 |
0 |
1 | 0 | 7 | 11 | 3 | 12 | 11 | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
'-' = Not available. |
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