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.


Map of Lyme disease cases in 2001


Map of Lyme disease cases in 2015


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