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West Nile Virus

West Nile virus surveillance will begin again May 2019.

View previous years WNV Surveillance results.

West Nile virus (WNV) is a virus that is spread by mosquitoes. In Halton, the Health Department works to reduce the impact of WNV on the health of Halton residents by:

  • Informing and encouraging people to take steps to protect themselves from exposure to mosquitoes.
  • Informing and encouraging people to reduce mosquito-breeding sites around their homes.
  • Conducting monitoring & surveillance activities (e.g., setting mosquito traps, etc.) to detect the presence of the West Nile virus in dead birds and mosquitoes.
  • Monitoring for the presence of West Nile virus in humans by ensuring prompt reporting of all cases of the disease by working with local physicians and hospitals.
  • Larviciding (using pesticides to control the mosquito population) in catch basins and  storm water retention ponds where mosquito larvae have been detected.
  • Developing a plan for an adultciding program (the use of pesticides to kill adult mosquitoes) in order to be prepared in the event that adultciding is required to control the spread of West Nile virus.
  • Informing Halton residents about West Nile virus through media releases, pesticide use notices posted in local newspapers, and posting the latest data and information about WNV in Halton on our website.


The West Nile virus section of this website has information on a number of topics that may be of interest to you and your family:

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