West Nile virus and other mosquito-borne diseases national surveillance report — August 6 to August 12, 2017 (Week 32)
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West Nile virus
Canada
Humans
During week 32, August 6 to August 12, 2017, the province of British Columbia reported one asymptomatic infection and Ontario reported one additional clinical case of West Nile virus (WNv).
As of week 32, eight clinical cases (confirmed or probable) in Ontario and one asymptomatic infection in British Columbia have been reported to the Public Health Agency of Canada (PHAC). All eight cases from ON are currently unclassified and two were travel-related.
Mosquitoes
As of initial surveillance, 10,082 mosquito pools have been tested for WNv in Canada: Québec (588), Ontario (8,400), Manitoba (788), and Saskatchewan (306).
A total of 224 positive pools of WNv have been found in the following four provinces: 172 in Ontario [Brant County (2), Chatham-Kent (3), Durham Region (4), Eastern Ontario (3), Halton Region (15), Hamilton (4), Haliburton-Kwartha-Pine Ridge District (1), Hastings and Prince Edward Countries (7), Kingston-Frontenac and Lennox and Addington (2), Lambton (1), Middlesex-London (3), Niagara Region (7), Ottawa (11), Oxford County (1), Peel (40), Perth District (2), Peterborough County-City (1), Renfrew County and District (2), Simcoe Muskoka District (1), Toronto (31), Waterloo (2), Wellington-Dufferin-Guelph (2), Windsor-Essex County (21), and York Regional (6)]; Thirty-five in Manitoba [(Winnipeg (12), Southern (4), Interlake Eastern (5), and Prairie Mountain (12)]; Nine in Québec [Montérégie (6), Laval (1), and Mauricie-centre-du-Québec(2)]; and Eight in Saskatchewan.
Birds
As of week 32, the Canadian Wildlife Health Cooperative has tested seventy-two dead birds for WNv [Quebec (42), Ontario (23), Saskatchewan (3), Manitoba (2) and British Columbia (2)]. Of these, forty-eight were positive: thirty-two in Quebec [Chambly (1), Drummondville (1), Lachine (1), Lac-Supérieur (1), Laval (1), Mascouche (2), Montréal (1), Mont Royal (1), Pointe-Claire (1), Repentigny (1), Rivière-Rouge (2), Rosemère (1), Saint-Ambroise (1), Saint-Côme (2), Sainte-Madeleine (1), Sainte-Mélanie (1), Saint-Félix-de-Valois (1), Saint-Hippolyte (1), Saint-Hyacinthe (1), Saint Jean-de-Martha (1), Saint-Jean-des-Piles (1), Saint-Jérôme (1), Saint-Lambert (2), Saint-Ours (1), Sherbrooke (1), Terrebonne (1), Trois-Rivières (1), Unknown (1)]; two in Manitoba [Winnipeg (2)]; thirteen in Ontario [Campbellsville (6), Dryden (1), Guelph (1), Pickerel (1), Sarnia (1), Sudbury (1), Thunder Bay (2)]; and one in Saskatchewan [Saskatoon (1)].
Domestic Animals
As of week 32, two horses with WNV infection were reported to the Canadian Food Inspection Agency (CFIA): one in Hanna Alberta and the other in Saskatchewan. Also one pheasant with WNV infection located in Québec was reported to the CFIA.
United States and U.S. territories
As of August 15, 2017, 209 human cases of WNv have been reported by the Centers for Disease Control and Prevention (CDC). Of these, 126 (60%) were classified as neuroinvasive disease and eighty-three (40%) as non-neuroinvasive disease. In addition, fifty-two presumptive viremic blood donors have been identified.
Detailed information can be accessed via the CDC web site.
Europe and Neighbouring Countries
As of August 10, 2017, the European Centre for Disease Prevention and Control (ECDC) reported a total of twenty-eight (confirmed and probable) cases of West Nile fever [Greece (20), Israel (4), Italy (1), Romania (1), and Serbia (2)].
Detailed information can be accessed via the ECDC web site.
Other Mosquito-borne Diseases
Canada
Eastern Equine Encephalitis virus:
No human cases of eastern equine encephalitis virus have been reported to the Public Health Agency of Canada in 2017.
California Serogroup virus:
Since January 1, 2017, nine human cases of laboratory-confirmed cases/exposures of California serogroup virus were diagnosed by the National Microbiology Laboratory in Canada: Alberta (2), Saskatchewan (1), and Quebec (6). Of these cases, four cases were further classified as Jamestown Canyon virus.
*West Nile virus 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 Equivalent
As of week 32, ending August 12, 2017, there are nine WNv human clinical cases in Canada.
Report Week, 2017 | |||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
17 | 18 | 19 | 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 | 48 | 49 | 50 | Total | |
Newfoundland and Labrador | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||||
Prince Edward Island | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||||
New Brunswick | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||||
Nova Scotia | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||||
Québec | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||||
Ontario | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 1 | 4 | 1 | 8 | ||||||||||||||||||
Manitoba | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||||
Saskatchewan | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||||
Alberta | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||||
British Columbia | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | ||||||||||||||||||
Yukon | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||||
Northwest Territories | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||||
Nunavut | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||||
Total | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 1 | 3 | 2 | 9 |
Figure 3: Text Equivalent
Year | Report Week | ||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
17 | 18 | 19 | 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 | 48 | 49 | 50 | Total | |
2017 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 1 | 4 | 2 | 9 | ||||||||||||||||||
2016 | 0 | 0 | 0 | 1 | 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 | 0 | 0 | 0 | 106 |
2014 | 0 | 0 | 0 | 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 | 0 | 0 | 0 | 22 |
2012 | 0 | 0 | 0 | 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 | 0 | 0 | 0 | 450 |
2007 | 0 | 0 | 0 | 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 | 0 | 0 | 0 | 2378 |
2003 | 0 | 0 | 0 | 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 | 0 | 0 | 0 | 1450 |
Week 32: August 6 to August 12, 2017 | ||||||
---|---|---|---|---|---|---|
West Nile virus neurological syndrome | West Nile virus non-neurological syndrome | Unclassified/ unspecified |
Total clinical casesTable 1 Footnote 1 | Number of travel-related casesTable 1 Footnote 2 | West Nile virus asymptomatic infectionTable 1 Footnote 3 | |
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 |
Quebec | 0 | 0 | 0 | 0 | 0 | 0 |
Ontario | 0 | 0 | 1 | 1 | 0 | 0 |
Manitoba | 0 | 0 | 0 | 0 | 0 | 0 |
Saskatchewan | 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 | 0 | 0 | 1 | 1 | 0 | 1 |
Year to date: January 1 to August 12, 2017 | ||||||
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 |
Quebec | 0 | 0 | 0 | 0 | 0 | 0 |
Ontario | 0 | 0 | 8 | 8 | 2 | 0 |
Manitoba | 0 | 0 | 0 | 0 | 0 | 0 |
Saskatchewan | 0 | - | - | - | - | - |
Alberta | 0 | 0 | 0 | 0 | 0 | 0 |
British Columbia | 0 | 0 | 0 | 0 | 0 | 1 |
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 | 8 | 8 | 2 | 1 |
Table 1 Footnotes
|
Province | Year to date: January 1 to August 12, 2017 | ||
---|---|---|---|
Number of positive mosquito pools | Number of mosquito pools tested | Percentage of positive mosquito pools (%) | |
Quebec | 9 | 588 | 1.53 |
Ontario | 172 | 8400 | 2.05 |
Manitoba | 35 | 788 | 4.44 |
Saskatchewan | 8 | 306 | 2.61 |
Alberta | - | - | - |
British Columbia | - | - | - |
Newfoundland and Labrador | - | - | - |
Prince Edward Island | - | - | - |
Nova Scotia | - | - | - |
New Brunswick | - | - | - |
Yukon Territory | - | - | - |
Northwest Territory | - | - | - |
Nunavut | - | - | - |
Total | 224 | 10082 | 2.22 |
Province / Territory | Report week of 2017 | Total | |||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | ||
Newfoundland and Labrador | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||
Prince Edward Island | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||
New Brunswick | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||
Nova Scotia | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||
Quebec | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 147 | 147 | 147 | 147 | 0 | 0 | 588 | ||||||||
Ontario | 13 | 15 | 43 | 84 | 194 | 299 | 718 | 794 | 964 | 1003 | 1037 | 1053 | 1168 | 1015 | 8400 | ||||||||
Manitoba | 0 | 0 | 0 | 0 | 15 | 45 | 48 | 16 | 60 | 93 | 96 | 113 | 178 | 124 | 788 | ||||||||
Saskatchewan | 0 | 0 | 0 | 0 | 6 | 20 | 11 | 18 | 25 | 31 | 38 | 46 | 61 | 50 | 306 | ||||||||
Alberta | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||
British Columbia | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||
Yukon Territory | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||
Northwest Territory | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||
Nunavut | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||
Total | 13 | 15 | 43 | 84 | 215 | 364 | 777 | 828 | 1196 | 1274 | 1318 | 1358 | 1407 | 1189 | 10082 | ||||||||
Table 3 Footnotes
|
- Figure 5 Footnote a
-
Not all provinces are conducting dead bird surveillance as part of their own WNV surveillance program. However, WNV positive dead birds may be identified through the National Wildlife Disease Surveillance Program of the Canadian Wildlife Health Cooperative.
Figure 4: Text Equivalent
As of week 32, ending August 12 in 2017, there are four WNv cases in birds, in Canada.
Report Weeks of 2017 | |||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
17 | 18 | 19 | 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 | 48 | 49 | 50 | Total | |
Newfoundland and Labrador | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||||
Prince Edward Island | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||||
New Brunswick | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||||
Nova Scotia | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||||
Quebec | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 3 | 9 | 10 | 4 | 30 | ||||||||||||||||||
Ontario | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 1 | 1 | 0 | 0 | 2 | 5 | 0 | 12 | ||||||||||||||||||
Manitoba | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 2 | ||||||||||||||||||
Saskatchewan | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | ||||||||||||||||||
Alberta | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||||
British Columbia | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||||
Yukon Territory | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||||
Northwest Territory | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||||
Nunavut | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||||
Total | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 1 | 1 | 3 | 3 | 13 | 16 | 4 | 45 |
- Figure 5 Footnote b
-
Not all provinces are conducting dead bird surveillance as part of their own WNV surveillance program. However, WNV positive dead birds may be identified through the National Wildlife Disease Surveillance Program of the Canadian Wildlife Health Cooperative.
Figure 5: Text Equivalent
Report Week | ||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
17 | 18 | 19 | 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 | 48 | 49 | 50 | |
% positive 2003 | 0 | 0 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 3 | 3 | 6 | 7 | 10 | 17 | 21 | 38 | 35 | 43 | 46 | 45 | 45 | 58 | 29 | 20 | 15 | 8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
% positive 2012 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 33 | 67 | 33 | 67 | 33 | 50 | 67 | 64 | 67 | 33 | 67 | 67 | 55 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
% positive 2015 | 0 | 0 | 0 | 0 | 0 | 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 | 0 | 0 | 0 |
% positive 2016 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 33 | 50 | 23 | 25 | 80 | 43 | 43 | 20 | 36 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
% positive 2017 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 100 | 33 | 50 | 100 | 33 | 87 | 84 | 50 | ||||||||||||||||||
# positive 2017 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 1 | 1 | 3 | 3 | 13 | 16 | 4 |
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