Penn State assistant research professor Joyce Sakamoto looks at a tick.
Steph Krane / WPSU

A new Penn State study shows that the number of ticks that can carry Lyme disease is increasing in the state. Since 2000, Pennsylvania has had the highest number of Lyme disease cases in the country.

The study suggests that number might increase. Researchers found that the blacklegged tick, the most common carrier of Lyme disease, is now the dominant species of tick in the state.