West Nile Virus national surveillance report: August 19 to 25, 2018
Related Topics
West Nile Virus - Week 34 2018
Canada
- Human
-
During surveillance week 34, ending on August 25, 2018, the Public Health Agency of Canada was informed of eight additional West Nile virus (WNV) infections: one in Alberta, two in Manitoba, four in Ontario, and one in Québec.
As of week 34, a total of forty-one clinical cases of WNV have been reported by the following four provinces: Alberta (3), Manitoba (15), Ontario (18), and Québec (5). Of these, twelve (29%) have been classified as WNV neurological syndrome, eleven (27%) as WNV non-neurological and eighteen (44%) are unspecified. Three deaths have been reported. In addition, thirteen WNV asymptomatic infections have been reported: three in Alberta, five in Manitoba, two in Ontario and three in Québec.
- Mosquito
-
To date (week 34), the PHAC has been notified of 13,024 mosquito pools tested for WNV: Saskatchewan (725), Manitoba (1,841), Ontario (9,329) and Québec (1,129). Of these, a total of 459 (3.52%) have tested positive for WNV: forty-nine in Saskatchewan, 166 in Manitoba, 213 in Ontario, and thirty-one in Québec.
- Wild Bird
-
To date (week 34), sixty-six out of 119 dead wild birds have tested positive for WNV by the Canadian Wildlife Health Cooperative (CWHC) and Manitoba Agriculture: two in Saskatchewan, fourteen in Manitoba, twenty-five in Ontario, and twenty-five 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 forty-four horses with West Nile fever in the following three provinces: Alberta (21), Saskatchewan (19), and Manitoba (4).
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 30th, 975 human cases of West Nile fever have been reported to the European Centre for Disease Prevention and Control. Sixty-four deaths have been reported.
Weekly updates: 2018 West Nile fever transmission season
Other Mosquito-borne Diseases in Canada - Week 34 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 during 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 34, ending August 25, 2018, there are fifty-four 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 | 1 | 1 | 3 | 1 | - | - | - | - | - | - | - | - | - | - | - | - | - | 6 |
Manitoba | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 2 | 3 | 11 | 2 | - | - | - | - | - | - | - | - | - | - | - | - | - | 20 |
Ontario | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 3 | 2 | 3 | 3 | 4 | 4 | - | - | - | - | - | - | - | - | - | - | - | - | - | 20 |
Quebec | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 3 | 0 | 3 | 1 | 1 | - | - | - | - | - | - | - | - | - | - | - | - | - | 8 |
Total | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 4 | 5 | 9 | 7 | 20 | 8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 54 |
'-' = 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 | 4 | 4 | 9 | 7 | 20 | 8 | - | - | - | - | - | - | - | - | - | - | - | - | - | 54 |
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 34: August 19 to August 25, 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 | 1 | 1 | 2 | 4 | 0 | 0 |
Manitoba | 0 | 0 | 2 | 2 | 0 | 0 |
Saskatchewantable 1 note 4 | 0 | - | - | - | - | - |
Alberta | 0 | 0 | 0 | 0 | 0 | 1 |
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 | 1 | 1 | 4 | 6 | 0 | 2 |
Year to date: January 1 to August 25, 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 | 3 | 2 | 0 | 5 | 0 | 3 |
Ontario | 8 | 5 | 5 | 18 | 2 | 2 |
Manitoba | 1 | 1 | 13 | 15 | 0 | 5 |
Saskatchewantable 1 note 4 | 0 | - | - | - | - | - |
Alberta | 0 | 3 | 0 | 3 | 0 | 3 |
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 | 12 | 11 | 18 | 41 | 2 | 13 |
'-' = Not available. Table 1 notes
|
Province / Territory | Number of positive mosquito pools | Number of mosquito pools tested | Percentage of positive mosquito pools (%) |
---|---|---|---|
Saskatchewan | 49 | 725 | 6.75 |
Manitoba | 166 | 1,841 | 9.02 |
Ontario | 213 | 9,329 | 2.28 |
Québec | 31 | 1,129 | 2.75 |
Total | 459 | 13,024 | 3.52 |
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 | 52 | - | - | - | - | - | - | 725 |
Manitoba | 15 | 39 | 89 | 107 | 124 | 122 | 241 | 240 | 247 | 169 | 172 | 163 | 113 | - | - | - | - | - | - | 1,841 |
Ontario | 0 | 0 | 0 | 0 | 842 | 955 | 1,024 | 963 | 1,073 | 1,059 | 1,156 | 1,124 | 1,133 | - | - | - | - | - | - | 9,329 |
Québec | 0 | 69 | 77 | 105 | 105 | 113 | 109 | 109 | 110 | 99 | 123 | 110 | - | - | - | - | - | - | - | 1,129 |
Total | 15 | 123 | 184 | 229 | 1,116 | 1,245 | 1,464 | 1,416 | 1,526 | 1,433 | 1,513 | 1,462 | 1,298 | - | - | - | - | - | - | 13024 |
'-' = 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 34, ending August 25, 2018, there are sixty-six 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 | 1 | 7 | 8 | 6 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 25 |
Ontario | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 5 | 1 | 3 | 5 | 7 | 3 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 25 |
Manitoba | 0 | 0 | 3 | 0 | 0 | 0 | 0 | 0 | 7 | 0 | 3 | 5 | 1 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 14 |
Saskatchewan | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 2 |
Total | 0 | 0 | 3 | 0 | 0 | 1 | 0 | 7 | 11 | 4 | 15 | 15 | 10 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 66 |
'-' = 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 | 79 | 52 | 53 | - | - | - | - | - | - | - | - | - | - | - | - | - |
2018 | Number positive | 0 |
0 |
3 |
0 |
0 |
1 | 0 | 7 | 11 | 4 | 15 | 15 | 10 | - | - | - | - | - | - | - | - | - | - | - | - | - |
'-' = Not available. |
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