West Nile Virus national surveillance report: November 11 - December 15, 2018
Related Topics
West Nile Virus - Week 46-50 2018
Canada
- Human
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During surveillance weeks 46-50, ending on December 15, 2018, an additional 22 clinical cases of West Nile virus (WNV) were retrospectively reported to the Public Health Agency of Canada (PHAC). A number of other possible infections remain under investigation.
As of week 50, a total of 367 clinical cases of WNV have been reported by the following four provinces: Alberta (45), Manitoba (33), Ontario (126), and Québec (163). Of these, 200 (55%) have been classified as WNV neurological syndrome, 115 (31%) as WNV non-neurological syndrome and 52 (14%) as unspecified. Twenty-six deaths have been reported. In addition, 25 WNV asymptomatic infections have been reported: Alberta (5), Manitoba (2), Ontario (9), and Québec (9).
- Mosquito
-
During the 2018 West Nile virus season, PHAC was notified of 17,565 mosquito pools tested for WNV: Saskatchewan (773), Manitoba (1,924), Ontario (13,099), and Québec (1,769). Of these, 571 (3%) pools have tested positive for WNV: 52 in Saskatchewan, 168 in Manitoba, 305 in Ontario, and 46 in Québec.
- Bird
-
To date, 152 out of 313 (49%) dead wild birds have tested positive for WNV by the Canadian Wildlife Health Cooperative (CWHC), Manitoba Agriculture and British Columbia Ministry of Agriculture-Animal Health Centre: British Columbia (3), Alberta (1), Saskatchewan (4), Manitoba (36), Ontario (37), Québec (61), New Brunswick (3), Nova Scotia (2), and Prince Edward Island (5). In addition, one captive bird has tested positive for WNV: Nova Scotia (1).
It is the first time since 2003 that WNV activity has been detected in birds from the Maritimes (New Brunswick, Nova Scotia, and Prince Edward Island).
- Equine
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To date, the Canadian Food Inspection Agency (CFIA) has reported 123 domestic horses with West Nile virus in the following five provinces: British Columbia (1), Alberta (72), Saskatchewan (32), Manitoba (5), Ontario (11), and Québec (2).
United States and U.S. territories
As of December 11, 2,475 human cases of WNV have been reported to the US Centers for Disease Control and Prevention (CDC). Of these, 1,542 (62%) were classified as neuroinvasive disease and 933 (38%) as non-neuroinvasive disease. One hundred and twenty-four (124) deaths have been reported. In addition, 311 presumptive viremic blood donors have been identified.
Europe and Neighboring Countries
As of Deecmber 13, 2,083 human cases of West Nile fever have been reported to the European Centre for Disease Prevention and Control. One hundred and eighty-one deaths have been reported. (Weekly updates: 2018 West Nile fever transmission season).
Other Mosquito-borne Diseases in Canada
- Eastern Equine Encephalitis virus
-
The CFIA has reported 13 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
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Since May 1, 2018, 23 human cases/exposures of California serogroup virus have been reported by the National Microbiology Laboratory in the following seven provinces: Alberta (1), Saskatchewan (4), Manitoba (1), Ontario (5), Québec (5), New Brunswick (5), and Nova Scotia (2). Additional work to further type these as Jamestown Canyon virus or Snowshoe hare virus is on-going.
Figure and tables
- Footnote ±
-
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.
- Footnote *
-
WNV likely acquired while travelling outside of Canada.
*
Figure 2 - Text description
As of week 50, ending December 15, 2018, there are 392 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 | 48 | 49 | 50 | ||
Alberta | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 6 | 13 | 14 | 8 | 6 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 50 |
Manitoba | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 2 | 6 | 9 | 6 | 3 | 4 | 0 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 35 |
Ontario | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 4 | 4 | 8 | 12 | 19 | 21 | 18 | 17 | 13 | 5 | 6 | 4 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 135 |
Québec | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 3 | 9 | 14 | 24 | 27 | 28 | 29 | 15 | 10 | 5 | 1 | 2 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 172 |
Total | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 6 | 8 | 20 | 38 | 65 | 68 | 57 | 56 | 30 | 18 | 11 | 5 | 3 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 392 |
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 | 48 | 49 | 50 | ||
2018 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 6 | 8 | 20 | 38 | 65 | 68 | 57 | 56 | 30 | 18 | 11 | 5 | 3 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 392 |
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 | 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 | 0 | 0 | 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 | 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 | 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 | 0 | 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 | 0 | 0 | 0 | 1,450 |
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 | ||||
Report weeks 46-50: November 11 to December 15, 2018 | ||||||
British Columbia | 0 | 0 | 0 | 0 | 0 | 0 |
Alberta | 0 | 0 | 0 | 0 | 0 | 0 |
Saskatchewantable 1 note 4 | 0 | - | - | - | - | - |
Manitoba | 0 | 0 | 0 | 0 | 0 | 0 |
Ontario | 0 | 0 | 0 | 0 | 0 | 0 |
Québec | 0 | 0 | 1 | 1 | 0 | 0 |
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 |
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 | 0 |
Year to date: January 1 to December 15, 2018 | ||||||
British Columbia | 0 | 0 | 0 | 0 | 0 | 0 |
Alberta | 7 | 38 | 0 | 45 | 7 | 5 |
Saskatchewantable 1 note 4 | 0 | - | - | - | - | - |
Manitoba | 9 | 12 | 12 | 33 | 0 | 2 |
Ontario | 56 | 34 | 36 | 126 | 2 | 9 |
Québec | 128 | 31 | 4 | 163 | 0 | 9 |
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 |
Yukon Territory | 0 | 0 | 0 | 0 | 0 | 0 |
Northwest Territory | 0 | 0 | 0 | 0 | 0 | 0 |
Nunavut | 0 | 0 | 0 | 0 | 0 | 0 |
Total | 200 | 115 | 52 | 367 | 9 | 25 |
'-' = Not available. Table 1 notes
|
Province / Territory | Number of positive mosquito pools | Number of mosquito pools tested | Percentage of positive mosquito pools (%) |
---|---|---|---|
Saskatchewan | 52 | 773 | 6.7 |
Manitoba | 168 | 1,924 | 8.7 |
Ontario | 305 | 13,099 | 2.3 |
Québec | 46 | 1,769 | 2.6 |
Total | 571 | 17,565 | 3.3 |
Table 2 notes
|
Province / Territory | Report Week | Total | ||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | ||
SaskatchewanTable 3 footnote 1 | 0 | 15 | 18 | 17 | 45 | 55 | 90 | 104 | 96 | 106 | 62 | 72 | 52 | 31 | 10 | 0 | 0 | 0 | 0 | 773 |
ManitobaTable 3 footnote 2 | 15 | 39 | 89 | 107 | 124 | 122 | 241 | 240 | 247 | 169 | 172 | 163 | 113 | 39 | 29 | 15 | 0 | 0 | 0 | 1,924 |
OntarioTable 3 footnote 3 | 0 | 0 | 0 | 0 | 842 | 955 | 1,024 | 963 | 1,073 | 1,059 | 1,156 | 1,124 | 1,133 | 998 | 920 | 667 | 667 | 433 | 85 | 13,099 |
QuébecTable 3 footnote 4 | 0 | 69 | 77 | 105 | 105 | 113 | 109 | 109 | 110 | 99 | 123 | 122 | 102 | 103 | 122 | 80 | 85 | 92 | 0 | 1,769 |
Total | 15 | 123 | 184 | 229 | 1,116 | 1,245 | 1,464 | 1,416 | 1,526 | 1,433 | 1,513 | 1,481 | 1,400 | 1,171 | 1,081 | 806 | 752 | 525 | 85 | 17,565 |
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 or by specific provinces.
- Figure 4 note ‡
-
WNV positive birds are grouped by report week, based on best date available. Best date could include one of the following: date found, date of death, date submitted, or date received.
Figure 4 - Text description
As of week 50, ending December 15, 2018, there are 153 WNV cases in birds in Canada.
Province / Territory | Report Week* | ||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
May | Jun | Jul | Aug | Sept | Oct | Nov | Dec | 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 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | ||
British Columbia | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 |
Alberta | 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 | 0 | 0 | 0 | 1 |
Saskatchewan | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 |
Manitoba | 0 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 1 | 2 | 1 | 3 | 10 | 3 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 36 |
Nova Scotia | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 3 |
Ontario | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 1 | 3 | 5 | 3 | 8 | 5 | 4 | 0 | 1 | 1 | 3 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 37 |
Québec | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 3 | 14 | 11 | 5 | 4 | 6 | 2 | 6 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6 | 0 | 0 | 61 |
New Brunswick | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 |
Prince Edward Island | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 5 |
Total | 0 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 3 | 4 | 5 | 11 | 16 | 25 | 21 | 13 | 4 | 7 | 6 | 10 | 2 | 3 | 0 | 9 | 1 | 1 | 0 | 0 | 0 | 9 | 0 | 0 | 153 |
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