West Nile virus and other mosquito-borne diseases national surveillance report - November 5 to November 11, 2017 (Week 45)
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West Nile Virus
Canada
Humans
As of week 45, 181 clinical cases and six asymptomatic infections have been reported to the Public Health Agency of Canada (PHAC) by five provinces (Québec [19], Ontario [156], Manitoba [4], Alberta [7], and British Columbia [1]). Of the 181 clinical cases, sixty-nine (37%) were classified as WNV neurological syndrome, sixty-nine (38%) as WNV Non-neurological syndrome, and forty-three (25%) as unclassified. A total of thirty-one travel-related cases were reported. As of November 11, eight deaths associated with West Nile virus have been reported to the Public Health Agency of Canada during the 2017 season.
Mosquitoes
As of initial surveillance, 17,374 mosquito pools have been tested for WNV in Canada: Québec (1,849), Ontario (14,076), Manitoba (1,028), and Saskatchewan (421).
A total of 544 positive pools of WNV have been found in the following four provinces: 409 in Ontario [Brant County (2), Chatham-Kent (3), Durham Region (10), Eastern Ontario (5), Halton Region (36), Hamilton (31), Haliburton-Kwartha-Pine Ridge District (1), Hastings and Prince Edward Countries (13), Huron County (2), Kingston-Frontenac and Lennox and Addington (5), Lambton (2), Leeds, Grenville and Lanark District Health Unit (1), Middlesex-London (7), Niagara Region (15), Northwestern (1), Ottawa (35), Oxford County (1), Peel (114), Perth District (6), Peterborough County-City (2), Renfrew County and District (2), Simcoe Muskoka District (2), Toronto (62), Waterloo (3), Wellington-Dufferin-Guelph (3), Windsor-Essex County (29), and York Regional (16)]; forty-one in Manitoba[(Winnipeg (13), Southern (5), Interlake Eastern (7), and Prairie Mountain (16)]; eighty-four in Québec [Capitale-Nationale (9), Mauricie et du Centre-du-Québec (6), Montréal (10), Outaouais (3), Laval (5), Lanaudière (9), Laurentides (42)]; and ten in Saskatchewan.
Birds
As of week 45, the Canadian Wildlife Health Cooperative has tested 211 dead birds for WNV (Northwest Territories [1], Prince Edward Island [1], Quebec [112], Ontario [75], Saskatchewan [17], Manitoba [2], Alberta [1], and British Columbia [2]). Of these, 140 were positive: eighty-four in Quebec, two in Manitoba, forty-three in Ontario, and eleven in Saskatchewan.
Domestic Animals
The Canadian Food Inspection Agency has reported fifty-one horses with WNV infection in the following six provinces: Québec (7), Ontario (21), Manitoba (1), Saskatchewan (8), Alberta (10), and British Columbia (4).
United States and U.S. territories
As of November 14, 2017, 1,832 human cases of WNV have been reported by the Centers for Disease Control and Prevention. Of these, 1,210 (66%) were classified as neuroinvasive disease and 622 (34%) as non-neuroinvasive disease. One hundred and eleven deaths have been reported during the season. In addition, 221 presumptive viremic blood donors have been identified.
Detailed information can be accessed via the CDC web site.
Europe and Neighbouring Countries
As of November 16, 2017, the European Centre for Disease Prevention and Control reported a total of 285 (confirmed and probable) cases of West Nile fever (Austria [4], Bulgaria [1], Croatia [5], France [1], Greece [48], Hungary [21], Israel [28], Italy [57], Romania [66], Serbia [49], and Turkey [5]). Twenty-six deaths due to West Nile fever have been reported since the start of the season.
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 (EEEV) have been reported to the Public Health Agency of Canada in 2017. As of October 30, there have been two horses that tested positive for EEEV in Ontario.
California Serogroup virus
Since January 1, 2017, forty-five human cases of laboratory-confirmed cases/exposures of California serogroup virus were diagnosed by the National Microbiology Laboratory in Canada: British Columbia (1), Alberta (5), Saskatchewan (5), Manitoba (1), Ontario (1), Quebec (27), New Brunswick (3), and Nova Scotia (2). Of these cases, twenty-seven were further classified as Jamestown Canyon virus and one Snowshoe hare virus.
Figure 2: West Nile virus human clinical cases and asymptomatic infections by province/territory and by report week, as of November 11, 2017
- Figure 2 Footnote 1
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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 equivalent
As of surveillance week 45, ending November 11, 2017, there are 187 human cases of WNV in Canada; nineteen from Québec, 156 from Ontario, four from Manitoba, seven from Alberta, and one from British Columbia.
Report Week Figure 2 Footnote * | Total | |||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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 | ||
British Columbia | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | ||
Ontario | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 1 | 7 | 3 | 6 | 7 | 23 | 17 | 28 | 20 | 9 | 17 | 6 | 6 | 3 | 0 | 0 | 1 | 0 | 0 | 156 | ||
Alberta | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 4 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | ||
Manitoba | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 | ||
Québec | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 2 | 2 | 5 | 1 | 1 | 2 | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 19 | ||
Total | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 1 | 7 | 3 | 8 | 9 | 27 | 29 | 30 | 23 | 11 | 18 | 7 | 7 | 3 | 0 | 0 | 2 | 0 | 0 | 187 |
Figure 3: West Nile virus human clinical cases and asymptomatic infections by report week for selected years, in Canada
- Figure 3 Footnote 1
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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 equivalent
Report Week Figure 3 Footnote * | Total | ||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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 | ||
2017 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 1 | 7 | 3 | 8 | 9 | 27 | 29 | 30 | 23 | 11 | 18 | 7 | 7 | 3 | 0 | 0 | 2 | 0 | 0 | 187 | |||
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 | 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 | 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 | 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 | 2,378 | ||
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 | 1,450 |
Week 45: November 5 to November 11, 2017 | ||||||
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Province/Territory | WNV Cases | Total clinical casesTable 1 Footnote 1 | # of travel related WNV casesTable 1 Footnote 2 | # of asymptomatic WNV infectionsTable 1 Footnote 3 | ||
Neurological syndrome | Non-Neurological syndrome | Unclassified / Unspecified | ||||
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 | 0 | 0 | 0 | 0 |
Manitoba | 0 | 0 | 0 | 0 | 0 | 0 |
SaskatchewanTable 1 Footnote 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 Territories | 0 | 0 | 0 | 0 | 0 | 0 |
Nunavut | 0 | 0 | 0 | 0 | 0 | 0 |
Total | 0 | 0 | 0 | 0 | 0 | 0 |
Year to date: January 1 to November 11, 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 |
Québec | 15 | 3 | 0 | 18 | 0 | 1 |
Ontario | 50 | 59 | 43 | 152 | 29 | 4 |
Manitoba | 2 | 2 | 0 | 4 | 0 | 0 |
SaskatchewanTable 1 Footnote 4 | 0 | - | - | - | - | - |
Alberta | 2 | 3 | 0 | 7 | 2 | 0 |
British Columbia | 0 | 0 | 0 | 0 | 0 | 1 |
Yukon Territory | 0 | 0 | 0 | 0 | 0 | 0 |
Northwest Territories | 0 | 0 | 0 | 0 | 0 | 0 |
Nunavut | 0 | 0 | 0 | 0 | 0 | 0 |
Total | 69 | 69 | 43 | 181 | 31 | 6 |
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Province/Territory | Year to date: January 1 to October 21, 2017 | ||
---|---|---|---|
Number of positive mosquito pools | Number of mosquito pools tested | Percentage of positive mosquito pools (%) | |
Quebec | 84 | 1,849 | 4.54 |
Ontario | 409 | 14,076 | 2.91 |
Manitoba | 41 | 1,028 | 3.99 |
Saskatchewan | 10 | 421 | 2.38 |
Alberta | - | - | - |
British Columbia | - | - | - |
Newfoundland and Labrador | - | - | - |
Prince Edward Island | - | - | - |
Nova Scotia | - | - | - |
New Brunswick | - | - | - |
Yukon Territory | - | - | - |
Northwest Territory | - | - | - |
Nunavut | - | - | - |
Total | 544 | 17,374 | 3.13 |
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 | 41 | 42 | ||
Québec | - | - | - | - | - | - | - | - | 147 | 147 | 147 | 147 | 147 | 147 | 147 | 146 | 147 | 147 | 147 | 122 | 122 | 0 | 0 | 0 | 1,849 |
Ontario | 13 | 15 | 43 | 84 | 194 | 299 | 718 | 794 | 964 | 1,003 | 1,037 | 1,053 | 1,168 | 1,015 | 1,116 | 993 | 931 | 746 | 634 | 641 | 523 | 91 | 1 | 0 | 14,075 |
Manitoba | - | - | - | - | 15 | 45 | 48 | 16 | 60 | 93 | 96 | 113 | 178 | 122 | 86 | 104 | 25 | 20 | 7 | - | - | - | - | 1,028 | |
Saskatchewan | - | - | - | - | 6 | 20 | 11 | 18 | 25 | 31 | 38 | 46 | 61 | 52 | 39 | 40 | 34 | - | - | - | - | - | - | - | 421 |
Alberta | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 0 |
British Columbia | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 0 |
Newfoundland and Labrador | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 0 |
Prince Edward Island | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 0 |
Nova Scotia | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 0 |
New Brunswick | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 0 |
Yukon Territory | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 0 |
Northwest Territories | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 0 |
Nunavut | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 0 |
Total | 13 | 15 | 43 | 84 | 215 | 364 | 777 | 828 | 1,196 | 1,274 | 1,318 | 1,359 | 1,554 | 1,336 | 1,388 | 1,283 | 1,137 | 913 | 788 | 752 | 645 | 91 | 1 | 0 | 17,373 |
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Figure 4: Reported number of dead birds tested positive for WNV by province/territory and by report week, 2017 season in CanadaFigure 4 Footnote ¶
- Figure 4 Footnote 1
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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 45, ending November 11 in 2017, there are 140 WNV cases in birds, in Canada.
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 | Total | |
Manitoba | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | ||
Ontario | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 1 | 1 | 0 | 0 | 2 | 6 | 1 | 8 | 4 | 3 | 5 | 1 | 0 | 2 | 2 | 1 | 1 | 1 | 1 | 0 | 43 | ||
Québec | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 5 | 3 | 9 | 10 | 7 | 8 | 10 | 15 | 6 | 4 | 4 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 84 | ||
Saskatchewan | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 4 | 3 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 11 | ||
Total | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 1 | 1 | 5 | 3 | 13 | 18 | 8 | 19 | 17 | 19 | 12 | 5 | 4 | 4 | 3 | 1 | 1 | 1 | 1 | 0 | 140 |
Figure 5: Percentage of dead birds tested positive for WNV by report week in 2012, 2015, 2016, 2017 and number of dead birds tested positive, by report week, 2017, in CanadaFigure 5 Footnote ¶
- Figure 5 Footnote 1
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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 Weeks | Total | ||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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 | ||
2013 Percentage positive | 0 | 0 | 0 | 0 | 0 | 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 | 0 | 0 | 0 | 43.5% |
2014 Percentage positive | 0 | 0 | 0 | 0 | 0 | 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 | 0 | 0 | 0 | 20.4% |
2015 Percentage positive | 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 | 51.0% |
2016 Percentage positive | 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 | 80 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 26.2% |
2017 Percentage positive | - | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 100 | 33 | 50 | 100 | 33 | 87 | 86 | 57 | 76 | 74 | 86 | 80 | 67 | 60 | 33 | 60 | 100 | 0 | 50 | 100 | 0 | ||||||
2017 Number positive | - | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 1 | 1 | 5 | 3 | 13 | 18 | 8 | 19 | 17 | 19 | 12 | 5 | 4 | 4 | 3 | 1 | 1 | 1 | 1 | 0 | 140 |
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