West Nile Virus and Other Mosquito-Borne Disease National Surveillance Report - August 7 to August 13, 2016 (Week 32)

West Nile virus

Canada

Humans

During surveillance week 32, ending on August 13, 2016, two (2) additional human clinical cases of West Nile virus (WNV) were reported to the Public Health Agency of Canada (the Agency) in Manitoba.

As of surveillance week 32, a total of 3 human clinical cases have been reported in Manitoba. Of these, one case was classified as West Nile virus Neurological Syndrome (33%), and two as Unclassified (67%).

Mosquitoes

As of surveillance week 32, 118 (1.37 %) out of 8,600 mosquito pools have been tested positive for WNV in Canada: Manitoba (22), Ontario (58), Quebec (8), and Saskatchewan (30).

Birds

As of August 13, 2016, the Canadian Wildlife Health Cooperative has examined a total of 32 dead birds for WNV: Ontario (29), Quebec (1), and Saskatchewan (2). No positives have been reported.

Domestic Animals

As of Aug 13, 2016, no domestic animals tested positive for WNV, have been reported by the Canadian Food Inspection Agency.

United States and U.S. territories

As of August 13, 2016, the Centers for Disease Control and Prevention have reported 139 cases of West Nile virus disease from 27 states in the USA, including Idaho (1), Minnesota (2), Michigan (1), North Dakota (1), and Vermont (1). Of these, 63 (45%) were diagnosed as neuroinvasive disease cases and 76 (55% ) as non- neuroinvasive disease cases. One fatal case has been reported. In addition, 32 presumptive viremic blood donors have been identified.

Detailed information can be accessed via the CDC web site.

Europe and Neighbouring Countries

As of August 13, 2016, 11 human cases of WNV have been reported in the European Union and 24 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 August 13, 2016

Figure 1 - Text Description

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

As of surveillance week 32, ending August 13, 2016, a total of three human clinical cases of WNV have been reported in Manitoba, Canada.

FIGURE 2: WNV Human Clinical cases and Asymptomatic Infections, by Province/ Territory and by Report week, as of August 13, 2016

Figure 2 - Text Description
WNV Human Clinical cases and Asymptomatic Infections, by Province/ Territory and by Report week, as of August 13, 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
Prince Edward Island 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
Nova Scotia 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                                     0
Ontario 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0                                     0
Manitoba 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2                                     3
Saskatchewan 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
British Columbia 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
Northwest Territory 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
Total 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2                                     3

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

Figure 3 - Text Description
WNV Human Clinical cases and Asymptomatic Infections in Canada, by Report week for selected years
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 0 0 0 1 2                                     3
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 32: August 7 to August 13, 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 2 2 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 2 2 0 0
  Year to date: January 1 to August 13, 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 1 0 2 3 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 1 0 2 3 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 positive mosquito pools by Province/Territory, 2016 season
Province Year to date: January 1 to August 13, 2016Table 2 Footnote *
Number of positive mosquito pools Number of mosquito pools tested Percentage of positive mosquito pools (%)
Quebec 8 406 1.97
Ontario 58 6724 0.86
Manitoba 22 1107 1.99
Saskatchewan 30 363 8.26
Total 118 8600 1.37
Table 2 Footnote 8

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
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 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 _            
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 _            
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 _            
Quebec 0 0 0 0 0 0 0 0 0 0 2/59 0/67 0/65 2/78 4/69 0/68            
Ontario 0 0/6 0/5 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            
Manitoba 0 0 0 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            
Saskatchewan 0 0 0 0 0 0 0/1 0/9 0/8 0/14 1/26 0/37 0/31 3/62 10/67 16/105            
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 _            
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 _            
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 _            
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 _            
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 _            
Total 0 0/6 0/5 0/12 0/53 0/98 0/194 0/486 0/606 0/634 3/956 1/999 6/897 17/983 39/1305 52/1366            
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

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

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 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
New Brunswick 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
Quebec 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0                                     0
Ontario 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0                                     0
Manitoba 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
Alberta 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
Yukon Territory 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
Nunavut 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 0                                     0

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 - 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
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 0                                
# Positive 2016 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0                                
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