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2012 Surveillance Data

Overview

Surveillance is performed in BC by testing humans, horses, mosquitoes, and birds for WNV. Human testing occurs via blood and organ donations, and through physician requested tests. Horses that present with symptoms are seen by veterinarians and tested by private labs or the Animal Health Centre. Mosquitoes are trapped in some regions, and sent in to BCCDC for identification and testing (only Culex species, because they are the primary mosquito vectors). Lastly in some regions, clusters of dead birds belonging to the corvid family (ravens, crows, magpies and jays) are tested at the Animal Health Centre because they often die from the virus.

Summary of 2012 Surveillance

Updated: October 5¹	Humans²	Mosquito Pools³	Birds	Horses
#Tested	438	1912	22	n/a
# Positive	0	0	0	0

1. Surveillance begins on June 1, 2012.
2. The number of cases includes those classified as probable and confirmed.
3. A mosquito pool may contain up to 50 mosquitoes that are tested at one time.

Historic Positive Indicators in BC

	2011	2010	2009	2008	2007
Human¹	0	1	3(1)	1(1)	19(19)
Mosquito pool²	0	0	10	0	0
Bird	0	5	0	0	0
Horse	1	0	3	0	0

The number of cases in brackets denotes the number of cases considered to be travel-related. For example, 6 (*2) would indicate a total of 6 confirmed cases, 2 of which are travel-related.
1. The number of cases includes those classified as probable and confirmed.
2. A mosquito pool may contain up to 50 mosquitoes that are tested at one time.

Canadian Blood Services

Canadian Blood Services performs year-round WNV nucleic acid testing and this information is provided as aggregate, regional updates throughout the WNV season to BCCDC. This reporting provides geographic and timely human WNV surveillance data.

Between May 30 and October 2, 2012 there were 43,877 collections of blood in BC. There were no positive WNV screening test results.

Summary Reports

2012 West Nile Virus Surveillance Program Report, January 20, 2013 (PDF)

Surveillance Summary Rpt #7 September 6, 2012 (PDF)
Surveillance Summary Rpt #6 August 23, 2012 (PDF)
Surveillance Summary Rpt #5 August 9, 2012 (PDF)
Surveillance Summary Rpt #4 July 26, 2012 (PDF)
Surveillance Summary Rpt #3 July 12, 2012 (PDF)
Surveillance Summary Rpt #2 June 28, 2012 (PDF)
Surveillance Summary Rpt #1 June 14, 2012 (PDF)

Maps

Tables

Distribution of Birds Submitted in BC Over Time October 5, 2012 (PDF)
Distribution of Mosquito Species in BC Over Time October 3, 2012 (PDF)
Distribution of Culex pipiens in BC Over Time, 2007-2012 October 3, 2012 (PDF)
Distribution of Culex tarsalis in BC Over Time, 2007-2012 October 3, 2012 (PDF)

HSDA Weekly Reports

FHA - East October 3, 2012 (PDF)
FHA - South October 3, 2012 (PDF)
IHA - Okanagan October 3, 2012 (PDF)
IHA - Thompson Cariboo Shuswap October 3, 2012 (PDF)

Epi Week/Calendar Date Lookup Table

NOTE: Documents referenced on this page require Adobe Reader.

Last Updated: January 21, 2013