How Lyme Disease Cases Have Spread In The U.S.

The number of confirmed and probable Lyme disease cases in the U.S. more than doubled from 2001 to 2015. In 2015, 95 percent of confirmed cases were reported in the 14 states labeled below.

2001

Map of Lyme disease cases in 2001

2015

Map of Lyme disease cases in 2015

Notes

Because data are reported on the county level, the CDC randomly placed a dot within the county of residence for each case.

Source: Centers for Disease Control and Prevention

Credit: Map: CDC. Annotation: Katie Park/NPR