West Nile Virus and Other Mosquito-Borne Disease National Surveillance Report - November 1 to November 7, 2015 (Report Week 44)

Summary

West Nile Virus in Canada

Humans

During surveillance week 44, ending on Nov 7, 2015, one (1) human clinical case of West Nile virus was reported to the Public Health Agency of Canada (the Agency) in Quebec [ Abitibi-Témiscamingue (1) ].

As of surveillance week 44, a total of 74 human clinical cases have been reported to the Agency: Quebec (38), Ontario (31), and Manitoba (5). Of these, forty (54%) were classified as West Nile virus Neurological Syndrome, twenty-six (35%) as West Nile virus Non-Neurological Syndrome, and eight (11%) as Unclassified. In addition, four (4) asymptomatic infections from two provinces have been reported: three in Quebec [Laval (1) and Montérégie (2)] and one in Ontario [Toronto].

Mosquitoes

As of surveillance week 44, 173 (0.86%) out of the 20,046 mosquito pools have tested positive for West Nile virus in Canada: Quebec (33), Ontario (94), Manitoba (30), and Saskatchewan (16).

Dead Birds

As of surveillance week 44, the Canadian Wildlife Health Cooperative and the Quebec Ministry of Health and Social Services have reported a total of 47 dead birds that were tested positive for West Nile virus: Quebec (18), Ontario (28), and Saskatchewan (1).

Domestic Animals

As of surveillance week 44, the Canadian Food Inspection Agency and Le ministère de l'Agriculture, des Pêcheries et de l'Alimentation du Québec have reported a total of 11 horses that were tested positive for West Nile virus: Quebec (1), Ontario (3), Manitoba (1), Saskatchewan (3) and Alberta (3).

Seven horses from three provinces have tested positive for Eastern Equine Encephalitis virus: Ontario [Richmond (1), Carlsbad Springs (1), Gananoque (1), Brinston (1)], Quebec [Saint-Lambert (1)] and Nova Scotia [New Germany (1), South Brookfield (1)]

West Nile Virus in United States

As of November 10, 2015, the Centers for Disease Control and Prevention (CDC) has reported a total of 1,732 human cases of West Nile virus:

Alabama (9), Arizona (81), Arkansas (18), California (512), Colorado (90), Connecticut (10), Delaware (2 ), District of Columbia (3), Florida (9),Georgia (13), Idaho (13), Illinois (66), Indiana (18), Iowa (10),Kansas (30), Kentucky (0), Louisiana (43), Maine (1), Maryland (46), Massachusetts (9), Michigan (17), Minnesota (6), Mississippi (38), Missouri (28), Montana (3), Nebraska (67), Nevada (7), New Jersey (25), New Mexico ( 13), New York (26), North Carolina (4), North Dakota (23), Ohio (35), Oklahoma (77), Oregon (1), Pennsylvania (30), South Carolina (0), South Dakota(40), Tennessee (6 ), Texas (235), Utah (8), Virginia (22), Washington(24), Wisconsin (7) and Wyoming (7).

Of these, 1,121 (65%) were diagnosed as neuroinvasive disease cases, 611 (35%) as non-neuroinvasive disease cases. 94 fatal cases were reported. In addition, 301 presumptive viremic blood donors have been identified.

West Nile Fever in the European Union, European Economic Area and Neighbouring Countries

As of November 12, 2015, the European Centre for Disease Prevention and Control has reported 106 cases of West Nile fever in humans  in the EU Member States: Austria, Belgium, Bulgaria, Croatia, Republic of Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden and the UK,  as well as 174 cases in the neighboring countries:  Armenia, Azerbaijan, Belarus, Georgia, Moldova, Ukraine,  Algeria, Egypt, Israel, Jordan, Lebanon, Libya, Morocco, Palestine, Syria and Tunisia, since the beginning of the 2015 transmission season.

FIGURE 1: West Nile Virus human clinical cases and asymptomatic infections, by Province/Territory and by report week, 2015 season

Text equivalent below in Table 1

TABLE 1: West Nile Virus human clinical cases and asymptomatic infections, by Province/Territory and by report week, 2015 season  Table 1 Footnote *
Report Weeks of 2015
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 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 0 0  Not available  Not available  Not available  Not available 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 0 0  Not available  Not available  Not available  Not available 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 0 0  Not available  Not available  Not available  Not available 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 0 0  Not available  Not available  Not available  Not available 0
Quebec 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 1 2 1 2 6 4 2 5 7 7 2 0  Not available  Not available  Not available  Not available 41
Ontario 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0 1 5 2 5 1 5 2 3 3 1 2 0  Not available  Not available  Not available  Not available 32
Manitoba 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 2 1 0 0 0 0 0 0  Not available  Not available  Not available  Not available 5
Saskatchewan 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Table 1 Footnote ǂ Table 1 Footnote ǂ Table 1 Footnote ǂ Table 1 Footnote ǂ Table 1 Footnote ǂ Table 1 Footnote ǂ 0 0  Not available  Not available  Not available  Not available 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 0 0 0  Not available  Not available  Not available  Not available 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 0 0  Not available  Not available  Not available  Not available 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 0 0  Not available  Not available  Not available  Not available 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 0 0  Not available  Not available  Not available  Not available 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 0 0  Not available  Not available  Not available  Not available 0
Total 0 0 0 0 0 0 0 0 0 0 0 1 0 2 1 0 2 7 4 8 9 10 4 8 10 8 4 0  Not available  Not available  Not available  Not available 78
TABLE 2: West Nile Virus human clinical cases and asymptomatic infections by Province/Territory for the current report week and year to date, 2015 season
 Province/Territory West Nile virus neurological syndrome West Nile virus non-neurological syndrome Unclassified/unspecified Total clinical casesTable 2 Footnote 1 Number of travel-related casesTable 2 Footnote 2 West Nile virus asymptomatic infectionTable 2 Footnote 3
Week 44: Nov 1 to Nov 7, 2015
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 1 1 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 1 1 0 0
Year to date: January 1 to Nov 7, 2015
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 27 10 1 38 2 3
Ontario 12 12 7 31 4 1
Manitoba 1 4 0 5 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 40 26 8 74 6 4

FIGURE 2: West Nile Virus clinical cases and asymptomatic infections by report week for selected years

Text equivalent below in table 3

TABLE 3: West Nile Virus clinical cases and asymptomatic infections by report week for selected 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
2015 0 0 0 0 0 0 0 0 0 0 0 1 0 2 1 0 2 7 4 8 9 10 4 7 10 8 4 1  Not available  Not available  Not available
2014 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 4Table 3 Footnote * 3 5 6 1 1 0 0 1 0 0 0 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: Number of West Nile Virus mosquito pools tested weekly by Province/Territory - 2015 season Table 4.1 Footnote 1
Province / Territory Report week of 2015
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 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 0 120 127 132 131 129 126 133 125 123 131 128 123 108 107 Table 4.1 Footnote Table 4.1 Footnote 1743
Ontario 0 0 0 0 0 180 356 852 886 954 1152 1216 1219 1222 1176 1168 1168 987 881 802 712 526 396 65 Table 4.1 Footnote 15918
Manitoba 0 0 0 0 12 4 87 82 44 75 73 132 139 204 275 195 228 69 92 113 34 Table 4.1 Footnote Table 4.1 Footnote Table 4.1 Footnote Table 4.1 Footnote 1858
Saskatchewan 0 0 0 0 2 0 3 3 10 13 16 40 47 69 67 80 94 42 41 Table 4.1 Footnote Table 4.1 Footnote Table 4.1 Footnote Table 4.1 Footnote Table 4.1 Footnote Table 4.1 Footnote 527
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 14 184 446 937 940 1162 1368 1520 1536 1624 1644 1576 1615 1221 1145 1043 869 634 503 65 0 20046
TABLE 4.2: Number of mosquito pools tested and number of positive mosquito pools by Province/Territory, 2015 season
Province Year to date: January 1 to Nov 7, 2015
Number of positive mosquito pools Number of mosquito pools tested Percentage of positive mosquito pools (%)
Quebec 33 1743 1.89
Ontario 94 15918 0.59
Manitoba 30 1858 1.61
Saskatchewan 16 527 3.04
Total 173 20046 0.86

FIGURE 3: Reported number of dead birds testing positive for West Nile Virus by Province/Territory and by report week, 2015 season*

Text equivalent below in table 5

TABLE 5: Reported number of dead birds testing positive for West Nile Virus by Province/Territory and by report week, 2015 season Table 5 Footnote *
 Province / Territory Report week of 2015
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 0 0  Not available  Not available  Not available 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 0 0  Not available  Not available  Not available 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 0 0  Not available  Not available  Not available 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 0 0  Not available  Not available  Not available 0
Quebec 0 0 0 0 0 0 0 0 0 0 0 1 1 2 3 0 1 1 3 4 0 0 2 0 0 0 0 0  Not available  Not available  Not available 18
Ontario 0 0 0 0 0 0 0 1 0 0 0 0 4 1 8 0 0 1 1 0 2 4 2 0 4 0 0 0  Not available  Not available  Not available 28
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 0 0  Not available  Not available  Not available 0
Saskatchewan 0 0 0 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  Not available  Not available  Not available 1
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 0 0  Not available  Not available  Not available 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 0 0  Not available  Not available  Not available 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 0 0  Not available  Not available  Not available 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 0 0  Not available  Not available  Not available 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 0 0  Not available  Not available  Not available 0
Total 0 0 0 0 0 0 0 1 0 0 0 1 5 3 11 0 1 2 5 4 2 4 4 0 4 0 0 0  Not available  Not available  Not available 47

FIGURE 4: Percentage of dead birds testing positive for West Nile Virus in the 2015 season by report week, as compared to the 2003, 2012 and 2014 seasons

Text equivalent below in table 6

TABLE 6: Percentage of dead birds testing positive for West Nile Virus in the 2015 season by report week, as compared to the 2003, 2012 and 2014 seasons
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
Numbers positive 2015 0 0 0 0 0 0 0 1 0 0 0 1 5 3 11 0 1 2 5 4 2 4 4 0 4 0 0 0  Not available  Not available  Not available
Numbers tested 2015 0 0 0 0 0 0 0 1 0 0 1 1 6 5 15 7 4 3 6 7 4 5 6 2 19 0 0 0  Not available  Not available  Not available
Percentage 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  Not available  Not available  Not available
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 0 0 0 0 0 0
Numbers tested 2014 0 0 0 0 0 0 0 0 0 0 0 0 0 41Table 6 Footnote * 10 13 9 7 13 6 10 3 1 4 2 1 0 0 0 0 0
Percentage positive 2014 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 15 22 29 31 0 20 100 0 25 0 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 44 46 45 45 58 29 20 15 8 0 0 0 0
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