West Nile Virus national surveillance report: June 24 – June 30, 2018

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Organization: Public Health Agency of Canada

Published: July 10 2018

West Nile Virus - Week 26 2018

Canada

Human: As of surveillance week 26, ending on June 30, 2018, no human cases of West Nile virus (WNV) have been reported to the Public Health Agency of Canada (PHAC).
Mosquito: To date (week 26), the PHAC has been notified of 1,490 mosquito pools tested for WNV: 50 in Saskatchewan, 374 in Manitoba, 842 in Ontario, and 224 in Québec. Of these, one positive mosquito pool was found in Winnipeg, Manitoba.
Wild Bird: As of week 26, a total of eight dead wild birds have been tested for WNV by the Canadian Wildlife Health Cooperative (CWHC) and Manitoba Agriculture: three in Manitoba, one in Saskatchewan and four in Ontario. Of these, three dead wild birds were found positive for WNV in the Interlake-Eastern Regional Health Authority, Manitoba.
Equine: The Canadian Food Inspection Agency (CFIA) has not reported domestic animals tested positive for WNV, since the start of the 2018 WNV season.

United States and U.S. territories

As of June 26, ten human cases of WNV have been reported to the Centers for Disease Control and Prevention. Of these, five (50%) were classified as neuroinvasive disease and five (50%) as non-neuroinvasive disease. No deaths have been reported. In addition, two presumptive viremic blood donors have been identified.

Europe and Neighboring Countries

As of June 29, five human cases of West Nile fever have been reported to the European Centre for Disease Prevention and Control: Greece (4) and Italy (1). No deaths have been reported.

Weekly updates: 2018 West Nile fever transmission season

Other Mosquito-borne Diseases - Week 26 2018

Canada

Eastern Equine Encephalitis virus: No human cases of Eastern Equine Encephalitis virus (EEEV) have been reported to the PHAC, since the 2018 season.
California Serogroup virus: In surveillance week 26, no human cases/exposures of California serogroup virus were diagnosed by the National Microbiology Laboratory in the Public Health Agency of Canada.

Figure and tables

Figure 1. Text version below. — **Figure 1: Geographic distribution of WNV human clinical cases and asymptomatic infections in Canada, 2018**

Figure 2. Text version below. — **Figure 2: WNV human clinical cases and asymptomatic infections in Canada by reported week, 2018**

Table showing human clinical cases and asymptomatic infections associated with WNV in Canada, by province or territory and by week monitoring, dated June 30, 2018
Province / Territory	Report Week^{figure 2 table note ±}	Total
British Columbia	0	0	0	0	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	0
Alberta	0	0	0	0	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	0
Manitoba	0	0	0	0	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	0
Ontario	0	0	0	0	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	0
Québec	0	0	0	0	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	0
Total	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
'-' = Not available. Figure 2 table notes Figure 2 table note ± WNV 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. Return to figure 2 table note ± referrer

Figure 3. Text version below. — **Figure 3: WNV human clinical cases and asymptomatic infections for selected years by reported week, in Canada**

Table showing WNV human clinical cases and asymptomatic infections in Canada, by report week for selected years
Year	Report Week^{figure 3 table note *}	Total
2018	0	0	0	0	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	0
2017	0	0	1	0	1	1	7	3	8	10	26	31	31	27	13	16	7	8	4	1	1	3	0	0	0	200
2016	0	1	0	0	0	0	0	1	5	5	14	11	16	12	9	6	15	5	0	0	3	1	0	1	0	105
2014	0	0	0	0	0	0	1	0	0	0	4	3	5	6	1	1	0	0	1	0	0	0	0	0	0	22
2012	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	450
2007	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	2,378
2003	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	1,450
'-' = Not available. Figure 3 table notes Figure 3 table note * WNV 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. Return to figure 3 table note * referrer

Table 1: WNV human clinical cases and asymptomatic infections in Canada by reported weeks and year to date, 2018
Province/Territory	Clinical Cases			Total clinical cases^{table 1 note 1}	Total travel-related cases^{table 1 note 2}	Total asymptomatic infections^{table 1 note 3}
Province/Territory	Neurological syndrome	Non-neurological syndrome	Unclassified/ Unspecified	Total clinical cases^{table 1 note 1}	Total travel-related cases^{table 1 note 2}	Total asymptomatic infections^{table 1 note 3}
Week 26: June 24 to June 30, 2018
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
Québec	0	0	0	0	0	0
Ontario	0	0	0	0	0	0
Manitoba	0	0	0	0	0	0
Saskatchewan^{table 1 note 4}	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 June 30, 2018
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
Québec	0	0	0	0	0	0
Ontario	0	0	0	0	0	0
Manitoba	0	0	0	0	0	0
Saskatchewan^{table 1 note 4}	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
'-' = Not available. Table 1 notes Table 1 note 1 Total clinical cases are the sum of confirmed and probable: WNV neurological and non-neurological syndromes, along with any unclassified or unspecified cases. Return to table 1 note 1 referrer Table 1 note 2 Likely related to travel outside the Province/Territory. These cases are included in either the total clinical cases or WNV asymptomatic infections. Return to table 1 note 2 referrer Table 1 note 3 Satisfies WNV 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 WNV specific nucleic acid amplification test following any positive donor screen test result. Return to table 1 note 3 referrer Table 1 note 4 Saskatchewan provides counts of WNV neurological syndrome cases only. Return to table 1 note 4 referrer

Table 2: WNV mosquito surveillance^{table 2 note *} in Canada, as of June 30, 2018
Province / Territory	Number of positive mosquito pools	Number of mosquito pools tested	Percentage of positive mosquito pools (%)
Québec	0	224	0.00
Ontario	0	842	0.00
Manitoba	1	374	0.27
Saskatchewan	0	50	0.00
Total	1	1490	0.07
Table 2 notes Table 2 note 1 Mosquito surveillance data is reported by the following four provinces: Quebec, Ontario, Manitoba, and Saskatchewan. Return to table 2 note * referrer

Table 3: Total number of WNV mosquito pools tested by report week and by province/ territory, 2018^{table 3 note ‡}
Province / Territory	Report Week																Total
Province / Territory	25	26	27	28	29	30	31	32	33	34	35	36	37	38	39	40	Total
Québec	-	224	-	-	-	-	-	-	-	-	-	-	-	-	-	-	224
Ontario	-	842	-	-	-	-	-	-	-	-	-	-	-	-	-	-	842
Manitoba	-	374	-	-	-	-	-	-	-	-	-	-	-	-	-	-	374
Saskatchewan	-	50	-	-	-	-	-	-	-	-	-	-	-	-	-	-	50
Total	-	1490	-	-	-	-	-	-	-	-	-	-	-	-	-	-	1490
'-' = Not available. Table 3 notes Table 3 note 1 Detailed West Nile Virus mosquito surveillance data can be accessed through provincial/territorial websites. Return to table 3 note ‡ referrer

Figure 4. Text version below. — **Figure 4: Number of WNV positive dead wild birds in Canada by reported week, 2018^{figure 4 note *}**

Table showing the reported number of dead birds tested positive for WNV in Canada, by province/territory and by report week, 2017 season.
Province	Jun	Jul	Aug	Sept	Oct	Nov	Total
Québec	0	0	0	0	0	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	0
Ontario	0	0	0	0	0	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	0
Manitoba	0	0	3	0	0	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	3
Saskatchewan	0	0	0	0	0	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	0
Total	0	0	3	0	0	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	3
'-' = Not available.

Figure 5. Text version below. — **Figure 5: Percentage of dead wild birds positive for WNV by report week in 2012, 2015, 2016, 2017, 2018 and number of dead birds positive in Canada by report week, 2018^{figure 5 note *}**

Table showing percentage of dead wild birds positive for WNV by report week in 2012-2018 and number of dead birds positive in Canada by report week, 2018*
	Jun	Jul	Aug	Sept	Oct	Nov
2013	Percentage positive	0	0	0	0	20	0	0	56	20	45	47	38	38	75	69	67	60	67	0	50	100	0	17	0	0	0
2014	Percentage positive	0	0	0	0	0	0	0	0	0	0	15	20	29	31	0	27	75	0	20	0	50	0	0	0	0	0
2015	Percentage positive	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
2016	Percentage positive	0	0	0	0	0	0	0	0	0	0	33	50	23	25	80	43	43	20	36	0	80	0	0	0	0	0
2017	Percentage positive	0	0	0	100	25	50	100	33	87	86	53	77	74	87	80	71	57	31	43	33	20	50	50	0	0	0
2018	Percentage positive	0	0	100	0	0	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
2018	Number positive	0	0	3	0	0	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
'-' = Not available.

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2024-03-11

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West Nile Virus national surveillance report: June 24 – June 30, 2018

Related Topics

West Nile Virus - Week 26 2018

Canada

United States and U.S. territories

Europe and Neighboring Countries

Other Mosquito-borne Diseases - Week 26 2018

Canada

Figure and tables

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