A rare and potentially fatal tick-borne illness currently spreading across the United States can be traced back to a 1958 case involving a young boy on a farm.
The disease, known as Powassan virus, was named for the Ontario town near where it was first discovered.
At the time of his death, Lincoln Byers, a 4-year-old living in Canada, had a condition that medical professionals could not explain, the Boston Globe reported.
Years later, researchers discovered a tick harboring the same virus on a dead squirrel, finally providing an answer to the tragedy, but foreshadowing a growing public health challenge.
While once considered an obscure medical anomaly, Powassan virus cases have reached historic highs in the U.S., data show.
According to the Centers for Disease Control and Prevention, 76 Americans were diagnosed with the virus in 2025, the highest annual total on record. Previously, the U.S. averaged just seven to eight diagnoses each year.
