West Nile Virus – Ontario 2002 Ian K. Barker Canadian Cooperative Wildlife Health Centre Ontario...

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Page 1: West Nile Virus – Ontario 2002 Ian K. Barker Canadian Cooperative Wildlife Health Centre Ontario Veterinary College University of Guelph.
Page 2: West Nile Virus – Ontario 2002 Ian K. Barker Canadian Cooperative Wildlife Health Centre Ontario Veterinary College University of Guelph.

West Nile Virus – Ontario 2002

Ian K. Barker

Canadian Cooperative Wildlife Health Centre

Ontario Veterinary College

University of Guelph

Page 3: West Nile Virus – Ontario 2002 Ian K. Barker Canadian Cooperative Wildlife Health Centre Ontario Veterinary College University of Guelph.

West Nile Virus Transmission Cycle

Avian reservoirs

VIRUS VIRUS

Dead - - end hosts

Mosquito vectors Culex species mainly

Spill-overvia bridging vectors

VIRUS

Amplification

Page 4: West Nile Virus – Ontario 2002 Ian K. Barker Canadian Cooperative Wildlife Health Centre Ontario Veterinary College University of Guelph.

WNV Surveillance Method v.s. Virus Amplification in Nature

Page 5: West Nile Virus – Ontario 2002 Ian K. Barker Canadian Cooperative Wildlife Health Centre Ontario Veterinary College University of Guelph.

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

Page 6: West Nile Virus – Ontario 2002 Ian K. Barker Canadian Cooperative Wildlife Health Centre Ontario Veterinary College University of Guelph.

Enhanced Passive Surveillancefor WNV in Wild Birds

Canada 2001-2002

Health Unit Level

CCWHC Regional Lab

Health Canada Zoonoses/Special Pathogens

LaboratoryWinnipeg

Page 7: West Nile Virus – Ontario 2002 Ian K. Barker Canadian Cooperative Wildlife Health Centre Ontario Veterinary College University of Guelph.

CCWHC Dead Bird Processing• carcasses, sightings• accession, dissection, specimen collection

& shipment• database: tracking, reporting, mapping,

accounting

Page 8: West Nile Virus – Ontario 2002 Ian K. Barker Canadian Cooperative Wildlife Health Centre Ontario Veterinary College University of Guelph.
Page 9: West Nile Virus – Ontario 2002 Ian K. Barker Canadian Cooperative Wildlife Health Centre Ontario Veterinary College University of Guelph.
Page 10: West Nile Virus – Ontario 2002 Ian K. Barker Canadian Cooperative Wildlife Health Centre Ontario Veterinary College University of Guelph.

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

Page 11: West Nile Virus – Ontario 2002 Ian K. Barker Canadian Cooperative Wildlife Health Centre Ontario Veterinary College University of Guelph.
Page 12: West Nile Virus – Ontario 2002 Ian K. Barker Canadian Cooperative Wildlife Health Centre Ontario Veterinary College University of Guelph.

Dead Birds Detected Early in Outbreak

Page 13: West Nile Virus – Ontario 2002 Ian K. Barker Canadian Cooperative Wildlife Health Centre Ontario Veterinary College University of Guelph.

WNV Dissemination by Migratory Birds 2000 - 2001?

To Central and South America

Page 14: West Nile Virus – Ontario 2002 Ian K. Barker Canadian Cooperative Wildlife Health Centre Ontario Veterinary College University of Guelph.

Aug 1, 2002

Aug 23, 2002Sept. 7, 2002

WNV Explosion - 2002

Nov 1, 2002

Page 15: West Nile Virus – Ontario 2002 Ian K. Barker Canadian Cooperative Wildlife Health Centre Ontario Veterinary College University of Guelph.

Index case – WNV in a dead crow – May 19, 2002

Page 16: West Nile Virus – Ontario 2002 Ian K. Barker Canadian Cooperative Wildlife Health Centre Ontario Veterinary College University of Guelph.
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