West Nile Virus and Other Mosquito-Borne Diseases National Surveillance Report - October 2 to October 8, 2016 (Week 40)

West Nile virus

Canada

Humans

During surveillance week 40, ending on October 8, 2016, three (3) human clinical cases of West Nile virus (WNV) have been reported to the Public Health Agency of Canada (PHAC). Of these, one case was reported in Ontario [Peel region] and two cases in Quebec [Laval (1), Laurentides (1)].

As of surveillance week 40, a total of 83 human clinical cases have been reported to PHAC:  Alberta (4) [Calgary zone (1) and South zone (3)], Manitoba (20) [Interlake-Eastern (3), Northern (1), Prairie Mountain (2), Southern (8) and Winnipeg (6)], Ontario (40) [Ottawa (2),Toronto (19), Niagara (7), York (2), Durham (2), Halton (1), Windsor-Essex County (2), Peel (3) ,Haldimand-Norfolk (1) and Hamilton (1)] and Quebec (19) [Capitale-Nationale (1), Laurentides (2)Footnote *, Laval (5), Montérégie (4), Lanaudière (5), Montréal (1) and  Gaspésie - Îles-de-la-Madeleine (1)]. Of these, forty-eight cases (58 %) were classified as West Nile virus Neurological Syndrome, twenty- one cases (25 %) as West Nile virus Non-Neurological Syndrome, and fourteen cases (17 %) were unclassified. Six fatal cases have been reported.

In addition, five West Nile virus asymptomatic infections have been reported: Saskatchewan (1) [Mixed-Grass prairieFootnote x (1)] and Ontario (4) [Toronto (3), Windsor-Essex County (1)].

Mosquitoes

As of surveillance week 40, 345 (2.28 %) out of 15099 mosquito pools have tested positive for WNV in Canada: Saskatchewan (67), Manitoba (39), Ontario (211) and Quebec (28).

Birds

As of surveillance week 40,  the Canadian Wildlife Health Cooperative, the Québec Ministry of Agriculture, Fisheries and Food, and the Québec Centre for Wildlife Health have examined a total of 76 dead birds for WNV: British Columbia (2), Saskatchewan (4), Ontario (56), and Quebec (14), of which 25 (31%) dead birds have tested positive for WNV: British Columbia (2) [Cranbrook], Sakatchewan (2)[Saskatoon (1), Moose Jaw (1)], Ontario (9) [Bradford (1), Hamilton (1), Sarnia (1), Thorold (1), Toronto (1), Tecumseh (1), Burlington (1), Waterloo (1), Elora (1)] and Quebec (12) [Estrie (2), Lanaudière (1), Montérégie (5), Saint-Jean-Baptiste (1), Abitibi-Témiscaminigue (1), Montréal (1), Capitale Nationale (1)]. The positive birds were identified as American Crows (32%), Red- tailed Hawks (20%), Sharp-shinned Hawks (16%), Merlins (8%), Northern Goshawks (8%), Great- horned Owls (4%), Cooper's hawks(4%), Blue Jays (4%) and Burrowing Owls (4%).

Domestic Animals

As of surveillance week 40, forty-five horses with WNV infection have been reported to the Canadian Food Inspection Agency by various provincial/private animal health laboratories. These are preliminary data under validation: British Columbia (10), Alberta (7), Manitoba (13), Ontario (2) and Saskatchewan (13). In addition, the Quebec Ministry of Agriculture, Fisheries and Food, has reported one horse that tested positive for WNV, in Quebec.

United States and U.S. territories

As of October 11, 2016, the Centers for Disease Control and Prevention have reported a total of 1,264 human clinical cases of West Nile virus disease in 42 states in the US, including the following border states: Washington (9), Idaho (6), Montana (6), New York (11), North Dakota (68), Minnesota (41), Michigan (34), and Vermont (3). Of these, 645 (51%) were classified as neuroinvasive disease and 619 (49%) were classified as non- neuroinvasive disease. Forty-nine fatal cases have been reported. In addition, 193 presumptive viremic blood donors have been identified.

Detailed information can be accessed via the CDC web site.

Europe and Neighbouring Countries

As of October 6, 2016, a total of 188 human cases of WNV have been reported in the European Union and 230 cases have been reported in the neighbouring countries.

Detailed information can be accessed via the ECDC web site.

Eastern equine encephalitis

Canada

Domestic Animals

As of surveillance week 40, two horses with Eastern Equine Encephalitis in Québec, has been reported to the Canadian Food Inspection Agency by a provincial/private animal health laboratory.

Figure 1: Geographic distribution of WNV in humans (clinical cases) and horsesFigure 1 - Footnote * in Canada, as of October 8, 2016

Map of West Nile Virus number of cases

Figure 1 - Text Description

Map showing geographic distribution of WNV in Humans (clinical cases) and horses in Canada.

As of surveillance week 40 ending October 8, 2016, a total of 83 human clinical cases of WNV have been reported in Canada: Alberta (4), Manitoba (20), Ontario (40) and Quebec (19).

Forty-five horses with WNV infection have been reported (preliminary data): British Columbia (10), Alberta (7), Manitoba (13), Ontario (2) and Saskatchewan (13).

Figure 2: WNV human clinical cases and asymptomatic infections by province/ territory and by report week, as of October 8, 2016

Figure 2

Figure 2 - Text Description
WNV human clinical cases and asymptomatic infections by province/ territory and by report week, as of October 8, 2016
Report Weeks of 2016
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 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 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 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 0 0 0 0 0 0 0                     0
Quebec 0 0 0 0 0 0 0 1Figure 2 Footnote * 0 0 0 0 0 0 1 0 0 0 2 3 1 2 7 2                     19
Ontario 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 3 3 8 15 8 5 1                     44
Manitoba 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 4 4 6 0 3 0 0 0                     20
Saskatchewan 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0                     1
Alberta 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4 0 0 0 0 0                     4
British Columbia 0 0 0 0 0 0 0 0 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 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 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 0 0 0 0 0 0 0                     0
Total 0 0 0 0 0 0 0 1 0 0 0 0 0 0 2 2 6 7 15 11 19 10 12 3                     88
Figure 2 Footnote *

Acquired during WNV season in 2015

Return to figure 2 footnote * referrer

Figure 3: WNV human clinical cases and asymptomatic infections by report week for selected years, in CanadaFigure 3 Footnote *

Figure 3

Figure 3 - Text Description
WNV human clinical cases and asymptomatic infections by report week for selected years, in Canada
Years 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
2016 0 0 0 0 0 0 0 1 0 0 0 0 0 0 2 2 6 7 15 11 19 10 12 3                     88
2015 0 0 0 0 0 0 0 0 0 0 0 1 1 2 1 0 2 7 4 8 9 11 4 8 11 8 4 0 1 0 0 0 0 0 82
2013 0 0 0 0 0 1 1 0 0 0 1 2 2 5 5 6 9 10 21 16 14 12 7 2 1 0 1 1 0 0 0 0 0 1 118
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
Table 1: West Nile virus human clinical cases and asymptomatic infections by province/territory for the current report week and year to date, 2016 season
  Week 40: October 2 to October 8, 2016
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 1 1 0 2 0 0
Ontario 1 0 0 1 0 0
Manitoba 0 0 0 0 0 0
Saskatchewan 0 0 0 0 0 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 2 1 0 3 0 0
  Year to date: January 1 to October 8, 2016
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 14Table 1 Footnote * 5 0 19Table 1 Footnote * 0 0
Ontario 27 8 5 40 3 4
Manitoba 6 5 9 20 0 0
Saskatchewan 0 0 0 0 0 1
Alberta 1 3 0 4 1 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 48 21 14 83 4 5
Table 1 Footnote 1

Total clinical cases is the sum of both probable and confirmed: West Nile virus neurological and non-neurological syndromes, along with any unclassified or unspecified cases.

Return to table 1 footnote 1 referrer

Table 1 Footnote 2

Likely related to travel outside the Province/Territory. These cases are included in either the total clinical cases or West Nile virus asymptomatic infections.

Return to table 1 footnote 2 referrer

Table 1 Footnote 3

Satisfies West Nile virus diagnostic test criteria in the absence of clinical criteria. This category could include asymptomatic blood donors whose blood is screened using a nucleic acid amplification test, by blood operators (i.e. Canadian Blood Services or Hema-Quebec) and is subsequently brought to the attention of public health officials. Blood operators in Canada perform a supplementary West Nile virus specific nucleic acid amplification test following any positive donor screen test result.

Return to table 1 footnote 3 referrer

Table 1 Footnote *

One of the cases was acquired in 2015.

Return to table 1 footnote * referrer

Table 2: Number of mosquito pools tested and number of positive mosquito pools by province/territory, 2016 season
Province Year to date: January 1 to October 8, 2016Table 2 Footnote ͌
Number of positive mosquito pools Number of mosquito pools tested Percentage of positive mosquito pools (%)
Quebec 28 935 2.99
Ontario 211 12173 1.73
Manitoba 39 1394 2.80
Saskatchewan 67 597 11.22
Total 345 15099 2.28
Table 2 Footnote ͌

In 2016, mosquito surveillance is conducted by the following provinces only: Quebec, Ontario, Manitoba and Saskatchewan

Return to table 2 footnote ͌ referrer

Table 3: Number of WNV positive mosquito pools/ total number of WNV mosquito pools tested by report week and by province/ territory, 2016 seasonTable 3 Footnote ǂ
Province / Territory Report week of 2016
20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
Newfoundland and Labrador Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _
Prince Edward Island Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _
New Brunswick Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _
Nova Scotia Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _
Quebec 0 0 0 0 0 0 0 2/59 0/67 0/65 2/78 4/69 2/79 6/76 4/67 2/78 1/89 0/79 1/77 0/52 NA
Ontario 0/12 0/49 0/90 0/190 0/460 0/542 0/562 0/802 1/795 2/688 5/649 20/927 30/947 36/882 42/886 29/906 17/836 19/767 7/706 2/364 1/102
Manitoba 0 0/4 0/8 0/3 0/17 0/56 0/58 0/69 0/100 4/113 7/192 5/241 6/246 15/143 1/65 1/42 0/29 0/8 Table 3 - Footnote Table 3 - Footnote Table 3 - Footnote
Saskatchewan 0 0 0 0/1 0/9 0/8 0/14 1/26 0/37 0/31 3/62 10/68 16/106 31/144 4/55 2/28 0/6 Table 3 - Footnote Table 3 - Footnote Table 3 - Footnote Table 3 - Footnote
Alberta Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _
British Columbia Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _
Yukon Territory Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _
Northwest Territory Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _
Nunavut Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _ Table 3 - Footnote _
Total 0/12 0/53 0/98 0/194 0/486 0/606 0/634 3/956 1/999 6/897 17/983 39/1305 54/1378 88/1245 51/1073 34/1054 18/960 19/854 8/783 2/416 1/102
Table 3 Footnote ǂ

Detailed West Nile virus mosquito surveillance data can be accessed through Provincial/ Territorial websites.

Return to table 3 footnote ǂ referrer

Table 3 - Footnote _

These jurisdictions do not maintain regular mosquito surveillance.

Return to first Table 3 - Footnote _ referrer

Table 3 - Footnote ¶

Mosquito surveillance has ended.

Return to first Table 3 - Footnote referrer

Figure 4: Reported number of dead birds tested positive for WNV by province/ territory and by report week, 2016 season in Canada

Figure 4

Figure 4 - Text Description
Reported number of dead birds tested positive for WNV by province/ territory and by report week, 2016 season in Canada
Report Weeks of 2016
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 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 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 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 0 0 0 0 0 0 0                     0
Quebec 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 3 1 4 1 1 1                     12
Ontario 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 3 0 0 1 2 0 1                     9
Manitoba 0 0 0 0 0 0 0 0 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 0 0 2 0 0 0 0                     2
Alberta 0 0 0 0 0 0 0 0 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 2 0 0 0 0 0 0 0 0                     2
Yukon Territory 0 0 0 0 0 0 0 0 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 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 0 0 0 0 0 0 0                     0
Total 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 3 3 3 3 5 3 1 2                     25

Figure 5: Percentage of dead birds tested positive for WNV by report week in 2012, 2015 and 2016, and number of dead birds tested positive for WNV, by report week, 2016, in CanadaFigure 5 Footnote

Figure 5

Figure 5 - Text Description
Percentage of dead birds tested positive for WNV by report week in 2012, 2015 and 2016, and number of dead birds tested positive for WNV, by report week, 2016, in Canada
Years 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
% 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
% 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
% Positive 2016 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40 100 20 75 75 71 100 50 100                
# Positive 2016 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 3 3 3 3 5 3 1 2                
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