Powassan virus (POWV) and Deer Tick Virus (DTV) are tick transmitted viruses that can cause meningoencephalitis. Deer tick virus is a flavivirus closely resembling Powassan virus. Because they are so related, deer tick virus is thought to be a genotype of Powassan virus, and is also called Powassan virus lineage II. Although still rare, the number of reported cases of people sick from Powassan virus has increased in recent years. Most cases in the United States occur in the northeast and Great Lakes regions from late spring through mid-fall when ticks are most active. Powassan virus will be transmitted to human host within 15 minutes of tick attachment. The time from tick bite to feeling sick (incubation period) ranges from 1 week to 1 month.
Initial symptoms can include:
Powassan virus can cause severe disease, including infection of the brain (encephalitis) or the membranes around the brain and spinal cord (meningitis). Symptoms of severe disease include:
Approximately 1 out of 10 people with severe disease die.
Approximately half of the people who survive severe disease have long-term health problems such as:
Copyright © 2019 ECO Laboratory - All Rights Reserved.