west nile virus – ontario 2002 ian k. barker canadian cooperative wildlife health centre ontario...
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West Nile Virus – Ontario 2002
Ian K. Barker
Canadian Cooperative Wildlife Health Centre
Ontario Veterinary College
University of Guelph
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West Nile Virus Transmission Cycle
Avian reservoirs
VIRUS VIRUS
Dead - - end hosts
Mosquito vectors Culex species mainly
Spill-overvia bridging vectors
VIRUS
Amplification
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WNV Surveillance Method v.s. Virus Amplification in Nature
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To detect and report the presence of WNVin the ecosystem
in timeto mitigate the risk of infectionin people and domestic animals
PremiseDead birds with WNVare detected/diagnosed
before people and domestic animalsbecome infected
Objective of Wild Bird Surveillance
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Enhanced Passive Surveillancefor WNV in Wild Birds
Canada 2001-2002
Health Unit Level
CCWHC Regional Lab
Health Canada Zoonoses/Special Pathogens
LaboratoryWinnipeg
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CCWHC Dead Bird Processing• carcasses, sightings• accession, dissection, specimen collection
& shipment• database: tracking, reporting, mapping,
accounting
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WNV Positive Wild Birds - Ontario 2001
Health Unit 1st + Bird Species Total WNV +
Winsdsor-Essex 8 August Crow 20Halton 13 August Blue Jay 7Peel 14 August Crow & Jay 17 Toronto 15 August Crow 41Ham-Wentworth 23 August Crow 4Chatham-Kent 24 August Blue Jay 3York 25 August Blue Jay 25Durham 29 August Crow 5Lond-Middlesex 29 August Crow 3Lambton 30 August Crow 1Niagara 11 September Blue Jay 1Waterloo 24 September Blue Jay 1
TOTAL 128
Last WNV positive birds found 29 October
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Dead Birds Detected Early in Outbreak
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WNV Dissemination by Migratory Birds 2000 - 2001?
To Central and South America
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Aug 1, 2002
Aug 23, 2002Sept. 7, 2002
WNV Explosion - 2002
Nov 1, 2002
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Index case – WNV in a dead crow – May 19, 2002
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