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2009 Surveillance Data

Surveillance for WNV in BC involves humans, horses, mosquitoes and birds (corvids).

Human testing occurs via blood and organ donations, and through physician requested tests. Horses that present with symptoms are seen by veterinarians and tested in private labs. Mosquitoes are trapped in some regions, and sent in to BCCDC for identification and testing (Culex species only). Lastly in some regions, dead birds belonging to the corvid family (ravens, crows, magpies and jays) are tested at the Animal Health Centre when identified through dead bird reporting.

Updated: on Oct 7¹	Humans	Birds	Mosquitoes²	Horses
# Tested	371	144	2474
# Positive	3(1)*	0	10	3

1. Surveillance begins on June 1st and ends on October 3rd.
2. A mosquito pool may contain up to 50 mosquitoes that are tested at one time.
* 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.
Note: This travel-related case is classified as probable; confirmatory testing is pending.