Powassan Virus on the Rise in Canada: What You Need to Know

Ticks transmit not only Lyme disease but also the rare Powassan virus. Cases of Powassan virus infection have recently increased in Canada, and Ontario has designated the virus as a major public health disease effective July 1, 2023. Powassan virus is spread when an infected tick bites a person, and the initial infection may be asymptomatic, but in more severe cases it can lead to neurological disease.

Prevention is Key: Understanding Powassan Virus Infection

A recent case of Powassan virus infection was reported in a nine-year-old boy who was infected after camping in northern Ontario in July 2023. The boy was in serious condition after being bitten by a tick, but fortunately recovered. Authorities believe he was infected by a tick bite.

Powassan virus belongs to the Flavivirus family and is transmitted mainly by rodents such as squirrels and mice. Most infected people have no symptoms, but symptoms such as fever, headache, nausea, and weakness may appear 1 to 4 weeks after infection and, in rare cases, can lead to serious complications such as encephalitis or meningitis.

Currently, the risk of contracting Powassan virus in Canada is very low. According to Health Canada, only 21 cases have been reported since 2017, and the risk of infection is much lower than that of Lyme disease. About 12,500 tick samples were identified in Canada in 2023, but most were from tick species that do not transmit viruses.

Prevention and Protection

To prevent viral infection, it is essential to check for ticks after going outside and remove any bites immediately. Test results for Powassan virus are usually available within 8 days. For more information, visit the Ontario Public Health Website or check out the eTick Website for tick prevention information.