West Nile Virus and Other Mosquito-Borne Disease National Surveillance Report - June 26 to July 2, 2016 (Report Week 26)

West Nile virus

Canada

Humans

As of surveillance week 26, ending July 2 in 2016, there are no human cases of West Nile virus (WNV) reported to the Public Health Agency of Canada.

Mosquitoes

As of surveillance week 26, a total of 2094 mosquito pools have been tested for WNV in Canada. There are no positive reports.

Birds

As of July 2 in 2016, the Canadian Wildlife Health Cooperative has examined a total of 16 dead birds for WNV. There are no positive reports.

Domestic Animals

As of July 2 in 2016, there are no cases of WNV in domestic animals.

United States and U.S. territories

As of July 2 in 2016, there are 23 cases of West Nile virus disease in the United States and U.S. territories, including Michigan (1). All of these cases (100%) were diagnosed as neuroinvasive disease. Detailed information can be accessed via the Centre for Disease Control and Prevention (CDC) web site.

Europe and Neighbouring Countries

As of July 2 in 2016, no cases have been reported in the European Union (EU) and seven cases have been reported in the neighbouring countries. Detailed information can be accessed via the ECDC web site.

FIGURE 1: Geographic Distribution of Human Clinical cases of WNV in Canada, as of July 2, 2016 season

Figure 1 - Text Description

Map showing geographic distribution of human clinical cases of WNV in Canada.

As of surveillance week 26, ending July 2, 2016, there are no human clinical cases of WNV in Canada.

FIGURE 2: WNV Human Clinical cases and Asymptomatic Infections in Canada, by Province/ Territory and by Report week, as of July 2, 2016 season

Figure 2 - Text Description

As of week 26, ending July 2 in 2016, there are no West Nile virus human clinical cases and asymptomatic infections in Canada.

Table showing WNV Human clinical cases and Asymptomatic Infections in Canada, by Province/ Territory and by Report week, as of week 26, ending July 2, 2016 season
  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
Prince Edward Island 0 0 0 0 0 0 0 0 0 0                                                 0
New Brunswick 0 0 0 0 0 0 0 0 0 0                                                 0
Nova Scotia 0 0 0 0 0 0 0 0 0 0                                                 0
Quebec 0 0 0 0 0 0 0 0 0 0                                                 0
Ontario 0 0 0 0 0 0 0 0 0 0                                                 0
Manitoba 0 0 0 0 0 0 0 0 0 0                                                 0
Saskatchewan 0 0 0 0 0 0 0 0 0 0                                                 0
Alberta 0 0 0 0 0 0 0 0 0 0                                                 0
British Columbia 0 0 0 0 0 0 0 0 0 0                                                 0
Yukon Territory 0 0 0 0 0 0 0 0 0 0                                                 0
Northwest Territory 0 0 0 0 0 0 0 0 0 0                                                 0
Nunavut 0 0 0 0 0 0 0 0 0 0                                                 0
Total 0 0 0 0 0 0 0 0 0 0                                                 0

FIGURE 3: WNV Human Clinical cases and Asymptomatic Infections in Canada, by Report week for selected yearsFigure 3 Footnote *

Figure 3 - Text Description
WNV Human Clinical cases and Asymptomatic Infections in Canada, 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 48 49 50 Total
2016 0 0 0 0 0 0 0 0 0 0                                                 0
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 in Canada, by Province/Territory for the current report week and year to date, 2016 season
  Week 26: June 26 to July 2, 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 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 July 2, 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 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
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 2: Number of mosquito pools tested and number of WNV positive mosquito pools in Canada, by Province/Territory, 2016 season
Province Year to date: January 1 to July 2, 2016Table 2 Footnote *
Number of positive mosquito pools Number of mosquito pools tested Percentage of positive mosquito pools (%)
Quebec 0 0 0
Ontario 0 1916 0
Manitoba 0 146 0
Saskatchewan 0 32 0
Total 0 2094 0
Table 2 Footnote ͌

During the 2016 WNV season in Canada, 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 mosquito pools tested in Canada, by Report week and by Province/ Territory, 2016 season Table 3 Footnote ǂ
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
Newfoundland and Labrador 0 0 0 0 0 0 0 0 0 0                        
Prince Edward Island 0 0 0 0 0 0 0 0 0 0                        
New Brunswick 0 0 0 0 0 0 0 0 0 0                        
Nova Scotia 0 0 0 0 0 0 0 0 0 0                        
Quebec 0 0 0 0 0 0 0 0 0 0                        
Ontario 0 0/6 0/5 0/12 0/49 0/90 0/190 0/460 0/542 0/562                        
Manitoba 0 0 0 0 0/4 0/8 0/3 0/17 0/56 0/58                        
Saskatchewan 0 0 0 0 0 0 0/1 0/9 0/8 0/14                        
Alberta 0 0 0 0 0 0 0 0 0 0                        
British Columbia 0 0 0 0 0 0 0 0 0 0                        
Yukon Territory 0 0 0 0 0 0 0 0 0 0                        
Northwest Territory 0 0 0 0 0 0 0 0 0 0                        
Nunavut 0 0 0 0 0 0 0 0 0 0                        
Total 0 0/6 0/5 0/12 0/53 0/98 0/194 0/486 0/606 0/634                        
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

FIGURE 4: Reported number of dead birds tested positive for WNV in Canada, by Province/ Territory and by Report week, 2016 season

Figure 4 - Text Description
Reported number of dead birds tested positive for WNV in Canada, by Province/ Territory and by Report week, 2016 season
  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
Prince Edward Island 0 0 0 0 0 0 0 0 0 0                                                 0
New Brunswick 0 0 0 0 0 0 0 0 0 0                                                 0
Nova Scotia 0 0 0 0 0 0 0 0 0 0                                                 0
Quebec 0 0 0 0 0 0 0 0 0 0                                                 0
Ontario 0 0 0 0 0 0 0 0 0 0                                                 0
Manitoba 0 0 0 0 0 0 0 0 0 0                                                 0
Saskatchewan 0 0 0 0 0 0 0 0 0 0                                                 0
Alberta 0 0 0 0 0 0 0 0 0 0                                                 0
British Columbia 0 0 0 0 0 0 0 0 0 0                                                 0
Yukon Territory 0 0 0 0 0 0 0 0 0 0                                                 0
Northwest Territory 0 0 0 0 0 0 0 0 0 0                                                 0
Nunavut 0 0 0 0 0 0 0 0 0 0                                                 0
Total 0 0 0 0 0 0 0 0 0 0                                                 0

FIGURE 5: Percentage of dead birds tested positive for WNV in Canada, by Report week in 2012, 2015 and 2016, and number of dead birds tested positive for WNV, by Report week, 2016 seasonFigure 5 Footnote

Figure 5 - Text Description
Percentage of dead birds tested positive for WNV in Canada, by Report week in 2012, 2015 and 2016, and number of dead birds tested positive for WNV, by Report week, 2016 season
  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 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 2012 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 2012 0 0 0 0 0 0 0 0 0 0                                            
# Positive 2016 2016 0 0 0 0 0 0 0 0 0 0                                            
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