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West Nile Virus and Other Mosquito-Borne Disease National Surveillance Report - September 21 to September 27, 2014 (Report Week 39)

Summary

Canada

Humans: During surveillance week 39 (September 21 to September 27, 2014), no human cases of West Nile virus were reported to the Public Health Agency of Canada.

As of surveillance week 39, 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)Note de bas de page 1 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 39, 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 39, the Canadian Wildlife Health Cooperative tested 105 dead birds for West Nile virus in Canada: Ontario (24), Quebec (17) and Saskatchewan (64). Of these, 14 (13.3%) dead birds have tested positive for West Nile virus in Canada: Ontario (6), Quebec (6) and Saskatchewan (2).

    Domestic Animals: As of surveillance week 39, the Canadian Food Inspection Agency> reported 14 horses have tested positive for West Nile virus in Canada: Alberta (6), Ontario (1), Quebec (1) and Saskatchewan (6).

    United States

    As of September 23, 2014, the Centers for Disease Control and Prevention (CDC) has reported 979 West Nile virus human disease cases:

    Alabama (1), Arizona (31), Arkansas (4), California (310), Colorado (79), Connecticut (3), District of Columbia (2), Florida (5), Georgia (8), Idaho (16), Illinois (13), Indiana (3), Iowa (11), Kansas (16), Louisiana (87), Maryland (2), Massachusetts (2), Michigan (1), Minnesota (6), Mississippi (38), Missouri (4), Montana (4), Nebraska (69), Nevada (2), New Jersey (3), New Mexico (7), New York (13), North Dakota (17), Ohio (6), Oklahoma (12), Pennsylvania (5), South Carolina (2), South Dakota (45), Tennessee (6), Texas (124), Utah (1), Virginia (3), Washington (8), Wisconsin (5) and Wyoming (5).

    Of these, 544 (55.6%) were diagnosed as neuroinvasive disease cases and 435 (44.4%) as non-neuroinvasive disease cases. Thirty-four fatal cases were reported. Two hundred and two presumptive viremic blood donors have been identified.

    European Union, European Economic Area and Neighbouring Countries

    During surveillance week 39, the European Centre for Disease Prevention and Control (ECDC) reported 13 human cases of West Nile fever in Europe: Hungary (6), Italy (5) and Romania (2). In the neighbouring countries, eight human cases were reported: Russia (1) and Serbia (7).

    As of September 25, 2014, 55 human cases of West Nile fever have been reported in Europe: Austria (1), Greece (15), Hungary (8), Italy (14) and Romania (17). In the neighbouring countries, 102 human cases were reported: Bosnia and Herzegovina (13), Israel (2), Russian Federation (29) and Serbia (58).

    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                
    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                
    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                
    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                
    Quebec 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 0 1 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                
    Manitoba 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1Note de bas de page ** 2 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                
    Alberta 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                
    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                
    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                
    Nunavut 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 4Note de bas de page * 3 3 6 1 1 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 39: September 21 to September 27, 2014
    West Nile virus Neurological syndrome West Nile virus Non-Neurological syndrome Unclassified/
    Unspecified    		 Total clinical
    casesNote de bas de page 1    		 Number of travel
    related casesNote de bas de page 2    		 West Nile virus
    asymptomatic infectionsNote de bas de page 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 September 27, 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 1Note de bas de page ** 1 3Note de bas de page * 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 7Note de bas de page * 4 18Note de bas de page * 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 4Note de bas de page * 3 3 6 1 1 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 Note de bas de page *
    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
    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
    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
    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
    Quebec 0 0 0 0 0 0 0 0 0 0 0 0 1 4 9 10 19 19Note de bas de page ** 39 70 99 112 119
    Ontario 0 0 0 0 0 0 0 0 0 0 0 0 0 2 5 9 11 13 30 43 52 56 56
    Manitoba 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7 7 14 19 22 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
    Alberta 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
    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
    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
    Nunavut 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
    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 September 27, 2014
    Number of mosquito
    pools tested    		 Number of positive
    mosquito pools    		 Percentage of positive
    mosquito pools (%)
    Quebec 10,555 119 1.1
    Ontario 13,740 56 0.4
    Manitoba 1,505 24 1.6
    Saskatchewan 824 20 2.4
    British Columbia 236 0 0
    Total 26,860 219 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 season Note de bas de page *
    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
    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
    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
    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
    Quebec 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 1 0 2 1 0 6
    Ontario 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 3 0 0 1 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
    Saskatchewan 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 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
    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
    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
    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
    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
    Total 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 2 2 4 0 2 2 0 14

    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 2 0
    Numbers tested 2014 0 0 0 0 0 0 0 0 0 0 0 0 0 4Note de bas de page * 10 13 9 6 13 3 8 2 0
    Percentage positive 2014 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 15 22 33 31 0 25 100 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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