West Nile virus weekly surveillance and monitoring

Year-to-date total of West Nile virus clinical cases and asymptomatic infections, as of October 26, 2019
Province/territory Clinical cases Asymptomatic infectionsFootnote 1 Year-to-date totalFootnote 2
Neurological Non-neurological Unclassified
British Columbia 0 1 0 0 1
Alberta 2 2 0 0 4
SaskatchewanFootnote 3 0 - - 0 -
Manitoba 0 1 1 0 2
Ontario 10 5 3 1 19
Quebec 5 1 5 0 11
Newfoundland and Labrador 0 0 0 0 0
Prince Edward Island 0 0 0 0 0
Nova Scotia 0 0 0 0 0
New Brunswick 0 0 0 0 0
Yukon Territory 0 0 0 0 0
Northwest Territories 0 0 0 0 0
Nunavut 0 0 0 0 0
Canada 17 10 9 1 37

Summary of West Nile virus and other mosquito-borne diseases

Latest analysis: October 13 to 26, 2019 (Week 42 & 43)

  • West Nile virus in Canada:
    • Human: Thirty-seven human cases have been reported to PHAC in Quebec (11), Ontario (19), Manitoba (2) Alberta (4), and British Columbia (1) to date. Of these, six cases reported travel outside of Canada: British Columbia (1), Alberta (2) and Ontario (3).
    • Mosquito: A total of 96 pools have tested positive for WNV in Manitoba (6), Ontario (71) and Quebec (19).
    • Wild Bird: Forty birds have tested positive for WNV in Saskatchewan (2), Ontario (25) and Quebec (13).
    • Equine: Seven horses have tested positive for WNV in British Columbia (1), Saskatchewan (1), Alberta (3), Ontario (1) and Quebec (1).
  • Other mosquito-borne diseases of interest:
    • Seven horses and two mosquito pools tested positive for EEEV in Ontario. No human cases of Eastern Equine Encephalitis virus (EEEV) have been reported to PHAC. 
      As of September 30, 2019, 19 human cases/exposures of California serogroup (CSG) virus have been reported.

For more information, visit the West Nile virus disease page.

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