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Middlesex-London Health Unit

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Vector-Borne Diseases

Vector-Borne Diseases are diseases that are passed on to humans through the bite of a ‘vector’. A ‘vector’ is a blood feeding insect or other organism that can pick up an infection from one host (a human or animal) and pass it on to another host through a bite. Some mosquitoes and tick species are examples of vectors. West Nile Virus and Eastern Equine Encephalitis Virus are examples of Vector-Borne Diseases that can be passed on by mosquitoes. Lyme disease is an example of a Vector-Borne Disease that can be passed on by ticks.


What is Middlesex-London Health Unit’s role?

In Ontario, under the Ontario Public Health Standards, each health unit is required to develop a local vector-borne management strategy.

The Vector-Borne Disease program at the Middlesex-London Health Unit helps to prevent and reduce the risk of West Nile Virus, Eastern Equine Encephalitis Virus and Lyme disease by:



Adult Mosquito

A picture of an adult mosquito biting a person


Education and Awareness

Picture of a bus shelter ad for Lyme Disease awareness

Additional Information

For more information about Vector-Borne Diseases, please contact the Vector-Borne Disease team at:

  • 519-663-5317
Date of creation: November 1, 2012
Last modified on: March 11, 2024