West Nile Virus and Other Mosquito-Borne Disease National Surveillance Report - November 1 to November 7, 2015 (Report Week 44)

Summary

West Nile Virus in Canada

Humans

During surveillance week 44, ending on Nov 7, 2015, one (1) human clinical case of West Nile virus was reported to the Public Health Agency of Canada (the Agency) in Quebec [ Abitibi-Témiscamingue (1) ].

As of surveillance week 44, a total of 74 human clinical cases have been reported to the Agency: Quebec (38), Ontario (31), and Manitoba (5). Of these, forty (54%) were classified as West Nile virus Neurological Syndrome, twenty-six (35%) as West Nile virus Non-Neurological Syndrome, and eight (11%) as Unclassified. In addition, four (4) asymptomatic infections from two provinces have been reported: three in Quebec [Laval (1) and Montérégie (2)] and one in Ontario [Toronto].

Mosquitoes

As of surveillance week 44, 173 (0.86%) out of the 20,046 mosquito pools have tested positive for West Nile virus in Canada: Quebec (33), Ontario (94), Manitoba (30), and Saskatchewan (16).

Alternative Formats

Download the PDF Version of this document (456 KB)

West Nile Virus in United States

As of November 10, 2015, the Centers for Disease Control and Prevention (CDC) has reported a total of 1,732 human cases of West Nile virus:

Alabama (9), Arizona (81), Arkansas (18), California (512), Colorado (90), Connecticut (10), Delaware (2 ), District of Columbia (3), Florida (9),Georgia (13), Idaho (13), Illinois (66), Indiana (18), Iowa (10),Kansas (30), Kentucky (0), Louisiana (43), Maine (1), Maryland (46), Massachusetts (9), Michigan (17), Minnesota (6), Mississippi (38), Missouri (28), Montana (3), Nebraska (67), Nevada (7), New Jersey (25), New Mexico ( 13), New York (26), North Carolina (4), North Dakota (23), Ohio (35), Oklahoma (77), Oregon (1), Pennsylvania (30), South Carolina (0), South Dakota(40), Tennessee (6 ), Texas (235), Utah (8), Virginia (22), Washington(24), Wisconsin (7) and Wyoming (7).

Of these, 1,121 (65%) were diagnosed as neuroinvasive disease cases, 611 (35%) as non-neuroinvasive disease cases. 94 fatal cases were reported. In addition, 301 presumptive viremic blood donors have been identified.

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

As of November 12, 2015, the European Centre for Disease Prevention and Control has reported 106 cases of West Nile fever in humans in the EU Member States: Austria, Belgium, Bulgaria, Croatia, Republic of Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden and the UK, as well as 174 cases in the neighboring countries: Armenia, Azerbaijan, Belarus, Georgia, Moldova, Ukraine, Algeria, Egypt, Israel, Jordan, Lebanon, Libya, Morocco, Palestine, Syria and Tunisia, since the beginning of the 2015 transmission season.

TABLE 1: West Nile Virus human clinical cases and asymptomatic infections, by Province/Territory and by report week, 2015 season ^{Table 1 Footnote *}
	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	48	Total
	Report Weeks of 2015
Table 1 Footnote ǂ This province has stopped human surveillance since week 37. Return to first table 1 footnote ǂ referrer Table 1 Footnote * 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. 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	0	0	Not available	Not available	Not available	Not available	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	Not available	Not available	Not available	Not available	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	Not available	Not available	Not available	Not available	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	Not available	Not available	Not available	Not available	0
Quebec	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1	0	1	2	1	2	6	4	2	5	7	7	2	0	Not available	Not available	Not available	Not available	41
Ontario	0	0	0	0	0	0	0	0	0	0	0	1	0	1	0	0	1	5	2	5	1	5	2	3	3	1	2	0	Not available	Not available	Not available	Not available	32
Manitoba	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1	2	1	0	0	0	0	0	0	Not available	Not available	Not available	Not available	5
Saskatchewan	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	^{Table 1 Footnote ǂ}	^{Table 1 Footnote ǂ}	^{Table 1 Footnote ǂ}	^{Table 1 Footnote ǂ}	^{Table 1 Footnote ǂ}	^{Table 1 Footnote ǂ}	0	0	Not available	Not available	Not available	Not available	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	0	0	Not available	Not available	Not available	Not available	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	Not available	Not available	Not available	Not available	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	Not available	Not available	Not available	Not available	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	Not available	Not available	Not available	Not available	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	Not available	Not available	Not available	Not available	0
Total	0	0	0	0	0	0	0	0	0	0	0	1	0	2	1	0	2	7	4	8	9	10	4	8	10	8	4	0	Not available	Not available	Not available	Not available	78

TABLE 2: West Nile Virus human clinical cases and asymptomatic infections by Province/Territory for the current report week and year to date, 2015 season
Province/Territory	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 infection^{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, 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
Week 44: Nov 1 to Nov 7, 2015
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	1	1	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	1	1	0	0
Year to date: January 1 to Nov 7, 2015
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	27	10	1	38	2	3
Ontario	12	12	7	31	4	1
Manitoba	1	4	0	5	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	40	26	8	74	6	4

TABLE 3: West Nile Virus clinical cases and asymptomatic infections by report week for selected 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
	Report week
Table 3 Footnote * One of these cases was likely exposed prior to the 2014 West Nile virus season. Return to table 3 footnote * referrer
2015	0	0	0	0	0	0	0	0	0	0	0	1	0	2	1	0	2	7	4	8	9	10	4	7	10	8	4	1	Not available	Not available	Not available
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	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: Number of West Nile Virus mosquito pools tested weekly by Province/Territory - 2015 season ^{Table 4.1 Footnote 1}
Province / Territory	Report week of 2015
Province / Territory	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	Total
Table 4.1 Footnote 1 Detailed West Nile virus mosquito surveillance data can be accessed through Provincial/Territorial websites. Return to table 4.1 footnote 1 referrer Table 4.1 Footnote ¶ Mosquito surveillance for 2015 has ended in these jurisdictions. Return to first 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
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
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
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
Quebec	0	0	0	0	0	0	0	0	0	120	127	132	131	129	126	133	125	123	131	128	123	108	107	^{Table 4.1 Footnote ¶}	^{Table 4.1 Footnote ¶}	1743
Ontario	0	0	0	0	0	180	356	852	886	954	1152	1216	1219	1222	1176	1168	1168	987	881	802	712	526	396	65	^{Table 4.1 Footnote ¶}	15918
Manitoba	0	0	0	0	12	4	87	82	44	75	73	132	139	204	275	195	228	69	92	113	34	^{Table 4.1 Footnote ¶}	^{Table 4.1 Footnote ¶}	^{Table 4.1 Footnote ¶}	^{Table 4.1 Footnote ¶}	1858
Saskatchewan	0	0	0	0	2	0	3	3	10	13	16	40	47	69	67	80	94	42	41	^{Table 4.1 Footnote ¶}	^{Table 4.1 Footnote ¶}	^{Table 4.1 Footnote ¶}	^{Table 4.1 Footnote ¶}	^{Table 4.1 Footnote ¶}	^{Table 4.1 Footnote ¶}	527
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	14	184	446	937	940	1162	1368	1520	1536	1624	1644	1576	1615	1221	1145	1043	869	634	503	65	0	20046

TABLE 4.2: Number of mosquito pools tested and number of positive mosquito pools by Province/Territory, 2015 season
Province	Year to date: January 1 to Nov 7, 2015
Province	Number of positive mosquito pools	Number of mosquito pools tested	Percentage of positive mosquito pools (%)
Quebec	33	1743	1.89
Ontario	94	15918	0.59
Manitoba	30	1858	1.61
Saskatchewan	16	527	3.04
Total	173	20046	0.86

TABLE 5: Reported number of dead birds testing positive for West Nile Virus by Province/Territory and by report week, 2015 season ^{Table 5 Footnote *}
Province / Territory	Report week of 2015
Province / Territory	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
Table 5 Footnote * Data from the Canadian Wildlife Health Cooperative and the Quebec Ministry of Health and Social Services 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	Not available	Not available	Not available	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	Not available	Not available	Not available	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	Not available	Not available	Not available	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	Not available	Not available	Not available	0
Quebec	0	0	0	0	0	0	0	0	0	0	0	1	1	2	3	0	1	1	3	4	0	0	2	0	0	0	0	0	Not available	Not available	Not available	18
Ontario	0	0	0	0	0	0	0	1	0	0	0	0	4	1	8	0	0	1	1	0	2	4	2	0	4	0	0	0	Not available	Not available	Not available	28
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	Not available	Not available	Not available	0
Saskatchewan	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	0	0	0	0	0	0	0	0	0	Not available	Not available	Not available	1
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	Not available	Not available	Not available	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	Not available	Not available	Not available	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	Not available	Not available	Not available	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	Not available	Not available	Not available	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	Not available	Not available	Not available	0
Total	0	0	0	0	0	0	0	1	0	0	0	1	5	3	11	0	1	2	5	4	2	4	4	0	4	0	0	0	Not available	Not available	Not available	47

TABLE 6: Percentage of dead birds testing positive for West Nile Virus in the 2015 season by report week, as compared to the 2003, 2012 and 2014 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
	Report week
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 2015	0	0	0	0	0	0	0	1	0	0	0	1	5	3	11	0	1	2	5	4	2	4	4	0	4	0	0	0	Not available	Not available	Not available
Numbers tested 2015	0	0	0	0	0	0	0	1	0	0	1	1	6	5	15	7	4	3	6	7	4	5	6	2	19	0	0	0	Not available	Not available	Not available
Percentage positive 2015	0	0	0	0	0	0	0	100	0	0	0	100	83	60	73	0	25	67	83	57	50	80	67	0	21	0	0	0	Not available	Not available	Not available
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	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	3	1	4	2	1	0	0	0	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	100	0	25	0	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	44	46	45	45	58	29	20	15	8	0	0	0	0

Page details

Date modified:: 2015-11-26

Language selection

Search