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West Nile Virus and Other Mosquito-Borne Disease National Surveillance Report - October 5 to October 11, 2014 (Report Week 41)

Summary

Canada

Humans: During surveillance week 41 (October 5 to October 11, 2014), no human cases of West Nile virus were reported to the Public Health Agency of Canada.

As of surveillance week 41, 18 human clinical cases of West Nile virus have been reported in Canada: three in Manitoba [Interlake-Eastern Health Region (1), Prairie Mountain Health Region (1)Footnote * and Winnipeg Health Region (1)], 10 in Ontario [Chatham-Kent (1), Halton Region (2), Lambton County (1), City of Ottawa (2), Simcoe-Muskoka District (1) and City of Toronto (3)] and five in Quebec [Lanaudière (1), Montérégie (2) and Montreal (2)].

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  • Surveillance of West Nile virus

    • Of the 18 human clinical cases, seven (38.9%) are classified as West Nile virus neurological syndrome, seven (38.9%) as West Nile virus non-neurological syndrome and four (22.2%) as unclassified/unspecified.

    One asymptomatic infection has been reported in Ontario: Windsor-Essex County.

    Mosquitoes: As of surveillance week 41, a reported 219 mosquito pools have tested positive for West Nile virus in Canada: 24 in Manitoba [Interlake-Eastern Health Region (7), Prairie Mountain Health Region (1), Southern Health Region (11) and Winnipeg Health Region (5)]; 56 in Ontario [Haliburton-Kawartha-Pine Ridge District (1), Halton Regional (3), City of Hamilton (7), Lambton (1), Middlesex-London (4), Niagara Regional (2), City of Ottawa (3), Peel Regional (22), City of Toronto (10), Windsor-Essex County (1) and York Regional (2)]; 119 in Quebec [Laval (13), Montérégie (42) and Montreal (64)] and 20 in Saskatchewan.

    Dead Birds: As of surveillance week 41, the Canadian Wildlife Health Cooperative tested 115 dead birds for West Nile virus in Canada: Ontario (25), Quebec (21) and Saskatchewan (69). Of these, 16 (14.0%) dead birds have tested positive for West Nile virus in Canada: Ontario (6), Quebec (8) and Saskatchewan (2).

    Domestic Animals: As of surveillance week 41, the Canadian Food Inspection Agency reported 20 horses have tested positive for West Nile virus in Canada: Alberta (7), Manitoba (1), Ontario (1), Quebec (3) and Saskatchewan (8).

    United States

    As of October 7, 2014, the Centers for Disease Control and Prevention (CDC) reported 1,301 West Nile virus human disease cases:

    Alabama (1), Arizona (50), Arkansas (5), California (427), Colorado (99), Connecticut (3), District of Columbia (3), Florida (10), Georgia (11), Idaho (18), Illinois (28), Indiana (4), Iowa (12), Kansas (28), Louisiana (106), Maryland (3), Massachusetts (3), Michigan (1), Minnesota (10), Mississippi (44), Missouri (10), Montana (5), Nebraska (99), Nevada (3), New Jersey (5), New Mexico (14), New York (15), North Dakota (17), Ohio (7), Oklahoma (14), Pennsylvania (6), South Carolina (2), South Dakota (51), Tennessee (6), Texas (155), Utah (2), Virginia (4), Washington (8), Wisconsin (7) and Wyoming (5).

    Of these, 732 (56.3%) were diagnosed as neuroinvasive disease cases and 569 (43.7%) as non-neuroinvasive disease cases. Forty-seven fatal cases were reported. Two hundred and forty-five presumptive viremic blood donors have been identified.

    European Union, European Economic Area and Neighbouring Countries

    During surveillance week 41, the European Centre for Disease Prevention and Control (ECDC) reported one human case of West Nile fever in Italy. In the neighbouring countries, 11 human cases were reported in Serbia.

    As of October 9, 2014, 69 human cases of West Nile fever have been reported in Europe: Austria (1), Greece (15), Hungary (11), Italy (20) and Romania (22). In the neighbouring countries, 120 human cases were reported: Bosnia and Herzegovina (13), Israel (9), Russian Federation (29) and Serbia (69).

    Figure 1. West Nile Virus clinical cases and asymptomatic infections, by Province/Territory and by report week, 2014 season

    * 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.

    Table 1: West Nile Virus clinical cases and asymptomatic infections, by Province/Territory and by report week, 2014 season
    Provinces and Territories Report week of 2014
    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
    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 1 1 1 0 1 0 0 0
    Ontario 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 2 0 2 5 1 0 0 0 0
    Manitoba 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1Figure 1 - Footnote ** 2 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 0 0 0 0 0 0
    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 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 0 0 0 0 0 1 0 0 0 4Figure 1 - Footnote * 3 3 6 1 1 0 0 0
    Table 2. West Nile Virus human clinical cases and asymptomatic infections by Province/Territory for the current report week and year to date, 2014 Season
    Provinces and Territories Week 41: October 5 to October 11, 2014
    West Nile virus neurological syndrome West Nile virus non-neurological syndrome Unclassified/
    unspecified    		 Total clinical
    casesFigure 1 - Footnote 1    		 Number of travel
    related casesFigure 1 - Footnote 2    		 West Nile virus
    asymptomatic infectionsFigure 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 0 0 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 0 0 0 0 0 0
      Year to date: January 1 to October 11, 2014
    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 4 1 0 5 0 0
    Ontario 2 5 3 10 2 1
    Manitoba 1 1Footnote ** 1 3Footnote * 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 7 7Footnote ** 4 18Footnote ** 2 1

    Figure 2. West Nile Virus clinical cases and asymptomatic infections by report week for selected years

    * 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.

    Table 3: West Nile Virus clinical cases and asymptomatic infections by report week for selected years
    Years Report week of 2014
    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
    2014 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 4Footnote * 3 3 6 1 1 0 0 0
    2013 1 0 0 0 0 1 1 0 0 0 1 2 1 5 5 8 17 11 13 13 11 9 1 6 1 0 4 1 0 1 0
    2012 1 0 0 0 0 0 0 0 0 0 3 5 11 16 27 53 63 57 43 43 45 24 30 14 9 5 1 0 0 0 0
    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
    2005 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4 4 11 28 28 38 45 27 15 7 12 3 3 1 0 0 0
    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
    Table 4.1: Reported cumulative number of West Nile Virus positive mosquito pools by Province/Territory and by report week, 2014 season Footnote *
    Provinces and
    Territories     		Report week of 2014
    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
    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 1 4 9 10 19 19Footnote ** 39 70 99 112 119 119 119
    Ontario 0 0 0 0 0 0 0 0 0 0 0 0 0 2 5 9 11 13 30 43 52 56 56 56 56
    Manitoba 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7 7 14 19 22 24 24 24 24 24 24
    Saskatchewan 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 2 9 19 20 20 20 20 20 20 20
    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 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 0 0 0 0 0 1 7 22 28 53 70 111 157 195 212 219 219 219
    Table 4.2: Number of mosquito pools tested and number of positive mosquito pools by Province/Territory, 2014 season
    Provinces and
    Territories    		 Year to date: January 1 to October 11, 2014
    Number of positive mosquito
    pools    		 Number of
    mosquito pools tested    		 Percentage of positive
    mosquito pools (%)
    Quebec 119 10,807 1.1
    Ontario 56 14,098 0.4
    Manitoba 24 1,505 1.6
    Saskatchewan 20 824 2.4
    British Columbia 0 236 0
    Total 219 27,470 0.8

    Figure 3. Reported number of dead birds testing positive for West Nile Virus by Province/Territory and by report week, 2014 season *

    * Data from the Canadian Wildlife Health Cooperative

    Table 5: Reported number of dead birds testing positive for West Nile Virus by Province/Territory and by report week, 2014 seasonFootnote *
    Provinces and
    Territories     		Report week of 2014
    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
    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 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 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 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 0
    Quebec 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 1 0 2 2 0 1 0 8
    Ontario 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 3 0 0 1 0 0 0 6
    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 0
    Saskatchewan 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 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 0
    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 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 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 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 0
    Total 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 2 2 4 0 2 3 0 1 0 16

    Figure 4. Percentage of dead birds testing positive for West Nile Virus in the 2014 season by report week, as compared to the 2003, 2012 and 2013 seasons

    Table 6: Percentage of dead birds testing positive for West Nile Virus in the 2014 season by report week, as compared to the 2003, 2012 and 2013 seasons
      Report week of 2014
    17 18 19 20 21 22 23 24 26 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
    Numbers positive 2014 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 2 2 4 0 2 3 0 1 0
    Numbers tested 2014 0 0 0 0 0 0 0 0 0 0 0 0 0 41Footnote * 10 13 9 7 13 6 11 3 1 2 0
    Percentage positive 2014 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 15 22 29 31 0 18 100 0 50 0
    Numbers positive 2013 0 0 0 0 0 0 0 0 0 1 0 0 5 2 13 9 6 6 18 9 6 6 2 0 1 0 0 0 0 0 0
    Numbers tested 2013 0 0 0 1 0 0 0 2 2 5 8 5 9 10 29 19 16 16 24 13 9 10 3 3 2 0 0 0 0 0 0
    Percentage positive 2013 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 0 0 0 0 0 0
    Percentage 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
    Percentage 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

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