West Nile Virus and Other Mosquito-Borne Disease National Surveillance Report - July 13 to July 19, 2014 (Report Week 29)

Summary

Humans: As of surveillance week 29 (July 13 to July 19, 2014), no human cases of West Nile virus (WNV) have been reported to the Public Health Agency of Canada (the Agency).

Mosquitoes: As of surveillance week 29, Quebec reported one mosquito pool tested positive for WNV in the Montréal region.

Dead Birds: No dead birds positive for WNV have been reported by the Canadian Wildlife Health Cooperative.

Domestic Animals: No animals positive for WNV have been reported by the Canadian Food Inspection Agency.

United States

Since the start of the 2014 WNV season, 29 human WNV cases [Arizona (1), California (9), Colorado (2), Georgia (1), Iowa (1), Louisiana (1), Minnesota (1), Mississippi (2), Missouri (1), Oklahoma (1), South Dakota (6), Tennessee (1), Texas (1) and Wisconsin (1)] have been reported by the Centers for Disease Control and Prevention. Of these, 14 (48.3%) were diagnosed as neuroinvasive disease cases and 15 (51.7%) as non-neuroinvasive cases. One fatal case was reported. Eight cases of presumptive viremic blood donors were reported.

Europe and Neighbouring Countries

Since the start of the 2014 WNV season, no human cases of WNV have been reported in the European Union/European Economic Area by the European Centre for Disease Prevention and Control. Seventeen human cases have been reported in neighbouring countries: Bosnia and Herzegovina (13), Russian Federation (1) and Serbia (3).

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

Table 1. WNV human clinical cases and asymptomatic infections by Province / Territory for the current Report Week and year to date, 2014 Season
Provinces and Territories July 13 to July 19, 2014 (Week 29)
West Nile virus Neurological syndrome West Nile virus Non-Neurological syndrome Unclassified/
Unspecified
Total clinical
casesFootnote 1
# of travel
related casesFootnote 2
West Nile virus
asymptomatic infectionsFootnote 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 19, 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 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

Figure 2. WNV clinical cases and asymptomatic infections by report week for selected years

Table 2: Reported cumulative number of WNV positive mosquito pools by Province / Territory and by report week, 2014 seasonFootnote *
Provinces and
Territories
Report weeks 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                                    
Prince Edward Island 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                                    
New Brunswick 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                                    
Ontario 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                                    
Saskatchewan 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                                    
British Columbia 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                                    
Northwest Territory 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                                    
Total 0 0 0 0 0 0 0 0 0 0 0 0 1                                    

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

Table 3: Reported number of dead birds testing positive for WNV by Province / Territory and by report week, 2014 season
Provinces Report Weeks of 2014 Total
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 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                                      
New Brunswick 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                                      
Quebec 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                                      
Manitoba 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                                      
Alberta 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                                      
Yukon Territory 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                                      
Nunavut 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                                      

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

Table 4: Percentage of dead birds testing positive for WNV in the 2014 season by report week, as compared to the 2003, 2012 and 2013 seasons
  Weeks 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
Numbers positive 2014 0 0 0 0 0 0 0 0 0 0 0 0 0                                    
Numbers tested 0 0 0 0 0 0 0 0 0 0 0 0 0                                    
Percentage positive 0 0 0 0 0 0 0 0 0 0 0 0 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 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 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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