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Vector-Borne Disease Surveillance Reports
The major vector-borne diseases of public health importance in Ontario are West Nile virus, Lyme disease, and eastern equine encephalitis virus​. 
PHO publishes weekly reports during the summer and fall seasons and an annual summary report.

Vector-Borne Disease Summary Reports



West Nile virus

We analyze provincial mosquito, human, and weather data. Public health units provide us with the mosquito and human data, and Environment Canada is our source for weather data. Each week we produce a vector surveillance report to provide both provincial and local perspectives:

Additional resources 

Lyme disease

Lyme disease has been present in Ontario for many years, but the numbers and geographical range of the tick vector has expanded. 

Eastern equine encephalitis virus

Eastern equine encephalitis virus (EEEV) has been present in the horse population in Ontario since 1938. In the last few years, surveillance data from health units and the First Nations Inuit Health Branch has detected the virus in the mosquito population. Due to this increased activity, surveillance has been enhanced even though the risk is low and there has never been a reported human case of EEEV in Ontario.

Eastern equine encephalitis: History and enhanced surveillance in Ontario

Page last reviewed:  
Page last updated: 2017-07-26 10:35 AM
Uncontrolled print copy. Valid only on day of Print: [date]
Page updated on [date/time] 2017-07-26 10:35 AM
© , Ontario Agency for Health Protection and Promotion