West Nile Virus and Other Mosquito-Borne Disease National Surveillance Report - October 12 to October 18, 2014 (Report Week 42)

Summary

West Nile Virus in Canada

Humans: During surveillance week 42 (October 12 to October 18, 2014), no human cases of West Nile virus were reported to the Public Health Agency of Canada.

As of surveillance week 42, 21 human clinical cases of West Nile virus have been reported in Canada: five in Manitoba [Interlake-Eastern Health Region (1), Prairie Mountain Health Region (2)^{Footnote *}, Southern Health Region (1) and Winnipeg Health Region (1)], 10 in Ontario [Chatham-Kent (1), Halton Region (2), Lambton County (1), City of Ottawa (2), Simcoe-Muskoka District (1) and City of Toronto (3)] and six in Quebec [Lanaudière (1), Montérégie (3) and Montreal (2)].

Alternative Formats

Download the PDF Version of this document (992 KB)

Related Topics

Surveillance of West Nile virus

Of the 21 human clinical cases, 10 (47.6%) are classified as West Nile virus non-neurological syndrome, nine (42.9%) as West Nile virus neurological syndrome and two (9.5%) as unclassified/unspecified.

One asymptomatic infection has been reported in Ontario: Windsor-Essex County.

Mosquitoes: As of surveillance week 42, a reported 219 mosquito pools have tested positive for West Nile virus in Canada: 24 in Manitoba [Interlake-Eastern Health Region (7), Prairie Mountain Health Region (1), Southern Health Region (11) and Winnipeg Health Region (5)]; 56 in Ontario [Haliburton-Kawartha-Pine Ridge District (1), Halton Regional (3), City of Hamilton (7), Lambton (1), Middlesex-London (4), Niagara Regional (2), City of Ottawa (3), Peel Regional (22), City of Toronto (10), Windsor-Essex County (1) and York Regional (2)]; 119 in Quebec [Laval (13), Montérégie (42) and Montreal (64)] and 20 in Saskatchewan.

Dead Birds: As of surveillance week 42, the Canadian Wildlife Health Cooperative tested 120 dead birds for West Nile virus in Canada: Ontario (30), Quebec (21) and Saskatchewan (69). Of these, 16 (13.3%) dead birds have tested positive for West Nile virus in Canada: Ontario (6), Quebec (8) and Saskatchewan (2).

Domestic Animals: As of surveillance week 42, the Canadian Food Inspection Agency reported 21 horses have tested positive for West Nile virus in Canada: Alberta (7), Manitoba (1), Ontario (1), Quebec (4) and Saskatchewan (8).

West Nile Virus Human Disease Cases in the United States

As of October 14, 2014, the Centers for Disease Control and Prevention (CDC) reported 1,444 West Nile virus human disease cases:

Alabama (2), Arizona (50), Arkansas (5), California (487), Colorado (99), Connecticut (4), District of Columbia (3), Florida (10), Georgia (11), Idaho (18), Illinois (30), Indiana (6), Iowa (12), Kansas (36), Louisiana (111), Maryland (5), Massachusetts (3), Michigan (1), Minnesota (13), Mississippi (44), Missouri (10), Montana (5), Nebraska (99), Nevada (3), New Jersey (6), New Mexico (14), New York (15), North Dakota (17), Ohio (9), Oklahoma (14), Pennsylvania (6), South Carolina (2), South Dakota (51), Tennessee (6), Texas (207), Utah (2), Virginia (4), Washington (11), Wisconsin (8) and Wyoming (5).

Of these, 830 (57.5%) were diagnosed as neuroinvasive disease cases and 614 (42.5%) as non-neuroinvasive disease cases. Forty-nine fatal cases were reported. Two hundred and fifty-nine presumptive viremic blood donors have been identified.

West Nile Fever in the European Union, European Economic Area and Neighbouring Countries

During surveillance week 42, the European Centre for Disease Prevention and Control (ECDC) reported four humans case of West Nile fever in Italy. In the neighbouring countries, no cases were reported.

As of October 16, 2014, 73 human cases of West Nile fever have been reported in Europe: Austria (1), Greece (15), Hungary (11), Italy (24) and Romania (22). In the neighbouring countries, 120 human cases were reported: Bosnia and Herzegovina (13), Israel (9), Russian Federation (29) and Serbia (69).

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

* West Nile virus clinical cases and asymptomatic infections are grouped by report week, based on episode date. Episode date could include one of the following: onset date, diagnosis date, lab sample date, or reporting date.

Table 1 - Long description for Figure 1

Table 1: West Nile Virus clinical cases and asymptomatic infections, by Province/Territory and report week, 2014 season
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
Table 1 - Footnote * One of these cases was likely exposed prior to the 2014 West Nile virus season. Return to table 1 - footnote * referrer Table 1 - Footnote This case was likely exposed prior to the 2014 West Nile virus season. Return to table 1 - footnote referrer
Newfoundland and Labrador	0	0	0	0	0	0	0	0	0	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	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	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	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	1	1	1	1	0	1	0	0	1	0
Ontario	0	0	0	0	0	0	0	0	0	0	0	0	1	0	0	0	2	0	2	5	1	0	0	0	0	0
Manitoba	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1^{Table 1 - Footnote **}	2	2	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	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	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	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	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	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	0	0	0	0	0	0	0	0	0
Total	0	0	0	0	0	0	0	0	0	0	0	0	1	0	0	0	4^{Table 1 - Footnote *}	3	5	6	1	1	0	0	1	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 42: October 12 to October 18, 2014
Provinces and Territories	West Nile virus neurological syndrome	West Nile virus non-neurological syndrome	Unclassified/ unspecified	Total clinical cases^{Table 2 - Footnote 1}	Number of travel related cases^{Table 2 - Footnote 2}	West Nile virus asymptomatic infections^{Table 2 - Footnote 3}
Table 2 - 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 2 - footnote 1 referrer Table 2 - 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 2 - footnote 2 referrer Table 2 - 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 nucleic acid amplification test following any positive donor screen test result. Return to table 2 - footnote 3 referrer Table 2 - Footnote * One of these cases was likely exposed prior to the 2014 West Nile virus season. Return to table 2 - footnote * 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 October 18, 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	5	1	0	6	0	0
Ontario	3	5	2	10	2	1
Manitoba	1	4^{Table 2 - Footnote *}	0	5^{Table 2 - Footnote *}	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	9	10^{Table 2 - Footnote *}	2	21^{Table 2 - Footnote *}	2	1

Figure 2. West Nile Virus clinical cases and asymptomatic infections by report week for selected years

Table 3 - Long description for Figure 2

Table 3: West Nile Virus clinical cases and asymptomatic infections by report week for selected years
Year	Report week
Year	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
Table 3 - Footnote * One of these cases was likely exposed prior to the 2014 West Nile virus season. Return to table 3 - footnote * referrer
2014	0	0	0	0	0	0	0	0	0	0	0	0	1	0	0	0	4^{Table 3 - Footnote *}	3	5	6	1	1	0	0	1	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 ^{Table 4.1 - 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
Table 4.1 - Footnote * Detailed West Nile virus mosquito surveillance data can be accessed through Provincial/Territorial websites. Return to table 4.1 - footnote * referrer Table 4.1 - Footnote Week 34 data was not available at the time of publication. Return to table 4.1 - footnote referrer
Newfoundland and Labrador	0	0	0	0	0	0	0	0	0	0	0	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	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	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	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	19	19^{Table 4.1 - Footnote **}	39	70	99	112	119	119	119	119	119	119
Ontario	0	0	0	0	0	0	0	0	0	0	0	0	0	2	5	9	11	13	30	43	52	56	56	56	56	56	56	56
Manitoba	0	0	0	0	0	0	0	0	0	0	0	0	0	0	7	7	14	19	22	24	24	24	24	24	24	24	24	24
Saskatchewan	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1	2	9	19	20	20	20	20	20	20	20	20	20	20
Alberta	0	0	0	0	0	0	0	0	0	0	0	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	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	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	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	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	7	22	28	53	70	111	157	195	212	219	219	219	219	219	219

Table 4.2: Number of mosquito pools tested and number of positive mosquito pools by Province/Territory, 2014 season
Provinces and Territories	Year to date: January 1 to October 18, 2014
Provinces and Territories	Number of positive mosquito pools	Number of mosquito pools tested	Percentage of positive mosquito pools (%)
Quebec	119	11,413	1.0
Ontario	56	14,116	0.4
Manitoba	24	1,505	1.6
Saskatchewan	20	824	2.4
British Columbia	0	236	0
Total	219	28,094	0.8

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

Table 5 - Long description for Figure 3

Table 5: Reported number of dead birds testing positive for West Nile Virus by Province/Territory and by report week, 2014 season ^{Table 5 - 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	Total
Table 5 - Footnote * Data from the Canadian Wildlife Health Cooperative. Return to table 5 - footnote * referrer
Newfoundland and Labrador	0	0	0	0	0	0	0	0	0	0	0	0	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	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	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	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	2	0	1	0	2	2	0	1	0	0	0	0	8
Ontario	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	2	3	0	0	1	0	0	0	0	0	0	6
Manitoba	0	0	0	0	0	0	0	0	0	0	0	0	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	0	0	0	0	0	0	0	0	0	0	0	0	2
Alberta	0	0	0	0	0	0	0	0	0	0	0	0	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	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	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	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	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	2	4	0	2	3	0	1	0	0	0	0	16

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

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 - Long description for Figure 4

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
Table 6 - Footnote * Data became available during Week 30; this is a cumulative number of dead birds tested from Week 1 to Week 30. Return to table 6 - footnote * referrer
Numbers positive	2014	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	2	2	2	4	0	2	3	0	1	0	0	0	0	-	-	-
Numbers tested	2014	0	0	0	0	0	0	0	0	0	0	0	0	0	41^{Table 6 - Footnote *}	10	13	9	7	13	6	10	4	1	4	2	1	0	0	-	-	-
Percentage positive	2014	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	15	22	29	31	0	20	75	0	25	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	2013	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	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

Page details

Date modified:: 2015-06-09

Language selection

Search

West Nile Virus and Other Mosquito-Borne Disease National Surveillance Report - October 12 to October 18, 2014 (Report Week 42)

Summary

West Nile Virus in Canada

Alternative Formats

Related Topics

West Nile Virus Human Disease Cases in the United States

West Nile Fever in the European Union, European Economic Area and Neighbouring Countries

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

Figure 2. West Nile Virus clinical cases and asymptomatic infections by report week for selected years

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

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

Page details

West Nile Virus and Other Mosquito-Borne Disease National Surveillance Report - October 12 to October 18, 2014 (Report Week 42)

Summary

West Nile Virus in Canada

West Nile Virus Human Disease Cases in the United States

West Nile Fever in the European Union, European Economic Area and Neighbouring Countries

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

Figure 2. West Nile Virus clinical cases and asymptomatic infections by report week for selected years

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

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

Page details

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