- Report a Dead Blue Jay or Crow
Find out how to report a dead blue jay or crow for surveillance purposes.
- Report Mosquitoes or Standing Water
The Vector-Borne Disease Team investigates mosquito and standing water concerns. Learn how to submit a concern.
- Prevention and Personal Protection
West Nile Virus spreads through mosquito bites. Learn how to protect your family and prevent mosquitoes.
How does West Nile Virus affect humans?
Humans get West Nile Virus (WNV) from the bite of an infected mosquito.1 The transmission cycle (how the virus is passed) begins when mosquitoes feed on the blood of an infected bird. Once a mosquito bites an infected bird, it becomes infected with WNV and could possibly transmit the virus to humans through a mosquito bite.
- Learn more about West Nile Virus in humans by reading about the signs and symptoms.
- Learn about how you can protect yourself from getting West Nile Virus by reading about prevention and personal protection.
Can all mosquitoes transmit West Nile Virus?
A 'vector' is the term used to describe a mosquito species that can transmit (pass) disease through a mosquito bite. Not all mosquito species are vectors. A ‘non-vector’ or ‘nuisance mosquito’ cannot carry a disease, and therefore cannot transmit disease to humans. Vector mosquito species must first bite an infected bird or animal in order to become infected themselves and able to pass the disease on through a mosquito bite. In Ontario, there are 12 different mosquito ‘vectors’ that are able to transmit West Nile Virus.2