West Nile virus and other mosquito-borne diseases national surveillance report — October 15 to October 21, 2017 (Week 42)
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West Nile Virus
Canada
Humans
During week 42, October 15 to October 21, 2017, one new case of West Nile Virus (WNV) was reported from Ontario to the Public Health Agency of Canada (PHAC). Retrospectively, six additional cases were reported by two provinces: four in Ontario and two in Alberta.
As of week 42, 173 clinical cases and six asymptomatic infections have been reported to the PHAC by five provinces (Québec [15], Ontario [152], Manitoba [4], Alberta [7], and British Columbia [1]). Of the 173 clinical cases, fifty-nine (34%) were classified as WNV neurological syndrome, sixty-nine (40%) as WNV Non-neurological syndrome, and forty-five (26%) as unclassified. A total of 22 travel-related cases were reported. As of October 21, six 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 42, the Canadian Wildlife Health Cooperative has tested 203 dead birds for WNV (Northwest Territories [1], Prince Edward Island [1], Quebec [109], Ontario [70], Saskatchewan [17], Manitoba [2], Alberta [1], and British Columbia [2]). Of these, 135 were positive: eighty-two in Quebec, two in Manitoba, forty 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 October 24, 2017, 1,622 human cases of WNV have been reported by the Centers for Disease Control and Prevention. Of these, 1,068 (66%) were classified as neuroinvasive disease and 554 (34%) as non-neuroinvasive disease. ninety-one deaths have been reported during the season. In addition, 209 presumptive viremic blood donors have been identified.
Detailed information can be accessed via the CDC web site.
Europe and Neighbouring Countries
As of October 19, 2017, the European Centre for Disease Prevention and Control reported a total of 261 (confirmed and probable) cases of West Nile fever (Austria [4], Bulgaria [1], Croatia [5], Greece [48], Hungary [19], Israel [17], Italy [54], Romania [62], Serbia [46], and Turkey [5]). Twenty 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. There have been no reports of horses testing positive for EEEV; however, there has been one horse reported with eastern equine encephalitis virus, from Ontario.
California Serogroup virus
Since January 1, 2017, 45 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 October 21, 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 week 42, ending October 21, 2017, there are 179 human clinical cases and asymptomatic infections associated with WNV in Canada.
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 | ||
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 | 6 | 18 | 14 | 30 | 20 | 8 | 16 | 10 | 6 | 4 | 0 | 1 | 0 | 0 | 0 | 152 |
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 | 4 | 1 | 1 | 2 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 15 |
Total | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 1 | 7 | 3 | 8 | 8 | 22 | 25 | 32 | 23 | 10 | 16 | 11 | 6 | 4 | 0 | 1 | 0 | 0 | 0 | 179 |
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 | 49 | 50 | ||
2017 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 1 | 7 | 3 | 8 | 8 | 22 | 25 | 32 | 23 | 10 | 16 | 11 | 6 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 179 |
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 | 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 | 0 | 0 | 0 | 0 | 1,450 |
Province/Territory | Week 42: October 15 to October 21, 2017 | |||||
---|---|---|---|---|---|---|
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 | 1 | 0 | 1 | 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 | 1 | 0 | 1 | 0 | 0 |
Year to date: January 1 to October 21, 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 | 12 | 2 | 0 | 14 | 0 | 1 |
Ontario | 43 | 60 | 45 | 148 | 20 | 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 | 59 | 69 | 45 | 173 | 22 | 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 42, ending October 21 in 2017, there are 135 WNV cases in birds, in Canada.
Report Week | ||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
14 | 15 | 16 | 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 | |
Manitoba | 0 | 0 | 0 | 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 | 0 | 0 | 0 | 0 | 0 | 2 |
Ontario | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 1 | 1 | 0 | 0 | 2 | 6 | 1 | 7 | 4 | 3 | 5 | 1 | 0 | 2 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 40 |
Québec | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 5 | 3 | 9 | 10 | 7 | 8 | 10 | 15 | 6 | 3 | 3 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 82 |
Saskatchewan | 0 | 0 | 0 | 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 | 0 | 0 | 0 | 0 | 0 | 11 |
Total | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 1 | 1 | 5 | 3 | 13 | 18 | 8 | 19 | 17 | 19 | 12 | 4 | 3 | 4 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 135 |
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 | ||
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 | 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 | 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 | 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 | 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 | ||||||||
2017 Number positive | - | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 1 | 1 | 5 | 3 | 13 | 18 | 8 | 19 | 17 | 19 | 12 | 4 | 3 | 4 | 3 | 1 | 0 | 135 |
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