CDC: Frequently Asked Questions About Powassan Virus Disease

Powassan (POW) virus disease is a rare, but often serious disease that is caused by a virus spread by infected ticks. Approximately 75 cases of POW virus disease were reported in the United States over the past 10 years. POW virus is one of a group of arthropod-borne viruses (arboviruses) that can cause inflammation of the brain (encephalitis). Learn more