City of Hamilton City of Hamilton
Submit SearchSubmit Search
City of Hamilton - Public Health Services

West Nile Virus (WNV)

West Nile virus (WNV) is a virus found in wild birds and carried by mosquitoes. When an infected mosquito bites a bird, the bird can become infected and can pass the virus on to other mosquitoes. When an infected mosquito bites a human, the virus can cause mild-to-severe symptoms, including West Nile fever or encephalitis.

Protect Yourself

West Nile Virus in Hamilton

  • Dead Bird Reporting 
  • Effective 2009, Hamilton will no longer be testing birds for West Nile Virus.  Dead bird testing is no longer required as an early indicator of West Nile Virus in Ontario because information collected over the past few years across the province has confirmed when and where the virus will most likely appear.  Effective 2010, we will no longer be tracking dead birds as we have found the data does not show us any trends and it has not been a good predictor of increased West Nile virus activity in our area.
  • Ontario will continue to use other indicators, such as mosquito surveillance, to determine the human health risk of WNV in the province.

If you have found a cluster of three or more dead birds or a large dead bird, for example waterfowl, the Canadian Co-operative Wildlife Help Centre may be interested in testing these birds for WNV. Please contact them directly at 1-866-673-4781or visit for more information.

Learn More About West Nile Virus

Links and Other Websites

Last updated: July 9, 2012

Contact Information