West Nile Virus and Other Mosquito-Borne Disease National Surveillance Report - August 3 to August 9, 2014 (Report Week 32)

Summary

Canada

Humans: As of surveillance week 32 (August 3 to August 9, 2014), no confirmed human cases of West Nile Virus (West Nile Virus) were reported to the Public Health Agency of Canada (the Agency).

Mosquitoes: Since the start of the 2014 West Nile Virus season, a reported 26 mosquito pools tested positive for West Nile Virus in Canada: 10 in Quebec [Montreal (8) Laval (1) and Montérégie]; nine in Ontario [Halton Region (1), Peel Region (4), Lambton Health Unit (1), Toronto Public Health (1) and Middlesex-London (2)] and seven in Manitoba [Interlake-Eastern Health Region (4), Winnipeg Health Region (1) and Southern Health Region (2)].

Dead Birds: During surveillance week 32, the Canadian Wildlife Health Cooperative tested two dead birds for West Nile Virus in Saskatchewan and both are positive for West Nile Virus.

Since the start of the 2014 West Nile Virus season, the Canadian Wildlife Health Cooperative has tested 39 dead birds for West Nile Virus in Canada: Saskatchewan (26), Ontario (10) and Quebec (3). Of these, two (5.1%) are positive for West Nile Virus.

Domestic Animals: Since the start of the 2014 West Nile Virus season, the Canadian Food Inspection Agency reported two horses tested positive for West Nile Virus in Canada: Alberta (1) and Saskatchewan (1).

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United States

Since the start of the 2014 West Nile Virus (West Nile Virus) season, 82 human West Nile Virus cases were reported by the Centers for Disease Control and Prevention [Arizona (13), Arkansas (1), California (19), Colorado (5), District of Columbia (1), Georgia (1), Iowa (3), Louisiana (11), Mississippi (5), Missouri (2), Nebraska (5), New York (1), Oklahoma (1), South Dakota (12), Tennessee (1), Texas (1) and Wisconsin (1)]. Of these, 39 (47.6%) were diagnosed as neuroinvasive disease cases and 43 (52.4%) as non-neuroinvasive cases. Four fatal cases were reported. Twenty-eight presumptive viremic blood donors have been identified.

European Union, European Economic Area and Neighbouring Countries

Since the start of the 2014 West Nile Virus (West Nile Virus) season, no human cases have been reported in the European Union/European Economic Area by the European Centre for Disease Prevention and Control. Twenty-five human cases have been reported in neighbouring countries: Bosnia and Herzegovina (13), Russian Federation (7) and Serbia (5).

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

* Episode date could include one of the following: onset date, diagnosis date, lab sample date, or reporting date.

Table 1: West Nile Virus clinical cases and asymptomatic infections, by Province/Territory and by report week, 2014 season ^{Footnote *}
Provinces and Territories	Report week 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	0	0	0
Prince Edward Island	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
Nova Scotia	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
Ontario	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
Saskatchewan	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
British Columbia	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
Northwest Territory	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
Total	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

Table 2. West Nile Virus human clinical cases and asymptomatic infections by Province/Territory for the current Report week and year to date, 2014 Season
Provinces and Territories	Week 32: August 3 to August 9, 2014
Provinces and Territories	West Nile virus Neurological syndrome	West Nile virus Non-Neurological syndrome	Unclassified/ Unspecified	Total clinical cases^{Footnote 1}	Number 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 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 August 9, 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. West Nile Virus clinical cases and asymptomatic infections by report week for selected years

* Episode date could include one of the following: onset date, diagnosis date, lab sample date, or reporting date.

Table 3: West Nile Virus clinical cases and asymptomatic infections by report week for selected years
Years	Report week of 2014
Years	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
2014	0	0	0	0	0	0	0	0	0	0	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: Reported cumulative number of West Nile Virus positive mosquito pools by Province/Territory and by report week, 2014 season ^{Footnote *}
Provinces and Territories	Report week 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	0	0	0
Prince Edward Island	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
Nova Scotia	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	1	4	9	10
Ontario	0	0	0	0	0	0	0	0	0	0	0	0	0	2	5	9
Manitoba	0	0	0	0	0	0	0	0	0	0	0	0	0	0	7	7
Saskatchewan	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
British Columbia	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
Northwest Territory	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
Total	0	0	0	0	0	0	0	0	0	0	0	0	1	6	21	26

Table 4.2: Detailed mosquito pools tested and positive mosquito pools by Province/Territory, 2014 season
	Year to date: January 1 to August 9, 2014
	Number of mosquito pools tested	Number of positive mosquito pools	Percentage of positive mosquito pools (%)
Newfoundland and Labrador	0	0	0
Prince Edward Island	0	0	0
New Brunswick	0	0	0
Nova Scotia	0	0	0
Quebec	6,329	10	0.2
Ontario	3,138	9	0.3
Manitoba	734	7	1.0
Saskatchewan	273	0	0
Alberta	0	0	0
British Columbia	101	0	0
Yukon Territory	0	0	0
Northwest Territory	0	0	0
Nunavut	0	0	0
Total	10,575	26	0.2

Figure 3. Reported number of dead birds testing positive for West Nile Virus by Province/Territory and by report week, 2014 season^{^{Footnote *}}

Table 5: Reported number of dead birds testing positive for West Nile Virus by Province/Territory and by report week, 2014 season ^{Footnote *}
Provinces and Territories	Report week 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	Total
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	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	2																2
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	2																2

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

Table 6: Percentage of dead birds testing positive for West Nile Virus in the 2014 season by report week, as compared to the 2003, 2012 and 2013 seasons
		Report week of 2014
		17	18	19	20	21	22	23	24	26	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	0	0	2
Numbers tested	2014	0	0	0	0	0	0	0	0	0	0	0	0	0	34	3	2
Percentage positive	2014	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	100
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	2013	0	0	0	1	0	0	0	2	2	6	8	5	9	10	29	19	16	16	24	13	9	10	3	3	2	0	0	0	0	0	0
Percentage positive	2013	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:: 2014-08-19

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West Nile Virus and Other Mosquito-Borne Disease National Surveillance Report - August 3 to August 9, 2014 (Report Week 32)

Summary

Canada

Alternative Formats

Related Topics

United States

European Union, European Economic Area and Neighbouring Countries

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