West Nile virus and other mosquito-borne disease national surveillance report - July 13 to 19, 2014 (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.

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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)
Provinces and Territories	West Nile virus Neurological syndrome	West Nile virus Non-Neurological syndrome	Unclassified/ Unspecified	Total clinical cases^{Footnote 1}	# of travel related cases^{Footnote 2}	West Nile virus asymptomatic infections^{Footnote 3}
Footnotes 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 footnote 1 referrer 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 first footnote 2 referrer 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 (NAT), 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 NAT following any positive donor screen test result. Return to footnote 3 referrer
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 season ^{Footnote *}
Provinces and Territories	Report weeks of 2014
Provinces and Territories	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
Footnotes Footnote 1 Detailed West Nile virus mosquito surveillance data can be accessed through Provincial/ Territorial websites Return to footnote * referrer
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
Provinces	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	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
		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
		Weeks of 2014
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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Date modified:: 2014-07-18

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