Ticks are Present in Thunder Bay and District

The percentage of blacklegged ticks In the City of Thunder Bay area infected with Borrelia burgdorferi (the causative agent of lyme Disease) is greater than 40% as of 2023.


The City of Thunder Bay and immediately surrounding area are considered a risk area for Lyme disease.

Lyme disease is caused by a bacterium called Borrelia burgdorferi, which is spread through the bite of infected blacklegged ticks. Infected blacklegged ticks need to be attached for at least 24 hours in order to transmit the bacteria that causes Lyme disease.

Most ticks found in the Thunder Bay District are wood ticks and do not carry the Lyme disease bacteria. Visit our Lyme Disease fact sheet page for more information. 

To reduce the risk of a tick bite and reduce the risk of Lyme disease, read on to learn more/

FOR 2024: The What to do if it's a blacklegged tick section has been updated to include calling TBDHU if a tick is identified as a blacklegged tick.



For Further Information

Call the Environmental Health Program: (807) 625-5900 or Toll-Free 1 (888) 294-6630.

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