Causes of Powassan virus disease

Learn about the causes of Powassan virus disease and how it is spread.

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Causes of Powassan virus disease

Powassan virus disease is a very rare, but often serious, disease that is transmitted to humans by infected ticks.

How Powassan virus disease is spread

There are three types of ticks that are known to transmit Powassan virus in Canada:

  • squirrel tick
  • groundhog tick
  • blacklegged tick

Powassan virus disease cannot spread from person-to-person. The incubation period (time from tick bite to onset of illness) ranges from 1 week to 1 month.

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