West Nile virus and other mosquito-borne diseases in Canada: Surveillance and monitoring

2023 situation update: up to Week 31 (ending August 5, 2023)

West Nile virus update

  • To date, one human case in Ontario has been reported to the Public Health Agency of Canada (PHAC).
  • Positive wild birds were detected in Saskatchewan (7), Manitoba (41), Ontario (13) and Quebec (2).
  • Positive mosquito pools were detected in Manitoba (30) and Ontario (71).
  • No positive equine cases have been reported.

Other mosquito-borne diseases of interest in Canada

  • One (1) case of Eastern equine encephalitis (EEE) virus in a horse in Ontario has been reported to PHAC. No EEE virus infections in humans have been reported.
  • No infections of California serogroup (CSG) viruses in humans have been reported to PHAC.

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