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2011 Surveillance Data

Overview
Summary of surveillance
Canadian Blood Services
Summary Reports

Maps
Tables

Overview

Surveillance is performed in BC by testing humans, horses, mosquitoes, and birds (corvids) 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 (of Culex species). 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.

Summary of surveillance

Updated: on October 12	Humans²	Mosquito Pools³	Birds	Horses
# Tested	415	2282	40	n/a
# Positive	0	0	0	1

1. Surveillance begins on June 1st.
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.

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 June 1 and October 11, 2011 there were 43, 684 collections of blood in BC. There were no positive WNV screening test results.