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Powassan (Pow) Virus Basics

Could the Powassan Virus Be Worse Than Lyme Disease?

With the month of May being Lyme Disease Awareness Month, and summer around the corner, we want to discuss a new tick-borne illness that has worried researchers. This new worry is the Powassan virus.

scapularis-387181-1920.jpgThe Powassan virus in deer ticks is a much rarer pathogen than the bacterium that produces Lyme; but it can be deadly and works much quicker. The virus can cause seizures, neurological problems, permanent disability and even death. In fact, 50-60 percent of cases have led to disability and 10 percent have led to fatality. There have been approximately 75 reported cases to the Centers for Disease Control. The Powassan virus has no treatment at this time.

Powassan can take effect in as little as 15 minutes compared to the Lyme bacterium which may take 24-48 hours.

Anyone bitten by an infected tick can get it, said Dr. Jennifer Lyons, chief of the Division of Neurological Infections and Inflammatory Diseases at Brigham and Women's Hospital in Boston.

"About 15% of patients who are infected and have symptoms are not going survive," said Lyons, who is also an assistant professor of neurology at Harvard Medical School. "Of the survivors, at least 50% will have long-term neurological damage that is not going to resolve."

Although new to us, the virus was first reported in 1958 in Ontario - a child was infected with an unexplained inflammation of the brain. It wasn't considered a big deal at the time because ticks weren't reportedly biting humans.

As the chart shows below, the virus has been detected in the Northeastern region of the United States. In 2012, Connecticut reported 19% of deer ticks were infected with Lyme Disease and 29% infected with the Powassan virus.

Powassan virus symptoms are similar to Lyme Disease and can be misdiagnosed like Lyme due to flu-like symptoms including:

  • Fever
  • Headache
  • Chills
  • Weakness
  • Loss of Memory/Confusion
  • Speech issues
  • Numbness


Powassan virus testing is available; but again, there is not a cure. Per the CDC, prevention is key in the fight against Powassan and other tick-borne diseases, and the following steps could be considered proper precautions:


  • Avoid areas with high grass and leaf litter and walk in the center of trails when hiking.
  • Use repellent that contains 20 percent or more DEET, picaridin, or IR3535 on exposed skin for protection that lasts several hours.
  • Use products that contain permethrin to treat clothing and gear, such as boots, pants, socks and tents or look for clothing pre-treated with permethrin.
  • Treat dogs for ticks. Dogs are very susceptible to tick bites and to some tick borne diseases. They may also bring ticks into your home. Tick collars, sprays, shampoos, or monthly “top spot” medications help protect against ticks.
  • Bathe or shower as soon as possible after coming indoors to wash off and more easily find crawling ticks before they bite you.
  • Conduct a full-body tick check using a hand-held or full-length mirror to view all parts of your body upon returning from tick-infested areas. Parents should help children check thoroughly for ticks. Remove any ticks right away.
  • Tumble dry clothes in a dryer on high heat for 10 minutes to kill ticks on dry clothing after you come indoors. If the clothes are damp, additional time may be needed.

The best thing people can do to avoid the Powassan virus is to avoid deer and tick bites at all costs. This means that homeowners should install a deer fence around their properties and gardeners should use deer repellents to scare away deer. Hikers should wear bright, long-sleeved clothing to easily detect ticks and spray DEET repellent products when staying outside for long periods of time.


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