Lyme Disease Map

This animated map shows the spread of Lyme disease, as reported to the CDC, between 2001 and 2011. A single blue dot represents each reported case and is placed randomly within the victim's county of residence.

Reported Lyme disease cases grew steadily in the Northeast, Upper Midwest, and western regions of the United States during that decade. The CDC has described Lyme disease as one of the most commonly reported notifiable diseases in the country.

Research has shown that the vast majority of Lyme disease infections are concentrated in thirteen states: Connecticut, Delaware, Maine, Maryland, Massachusetts, Minnesota, New Hampshire, New Jersey, New York, Pennsylvania, Vermont, Virginia, and Wisconsin. Confirmed cases have also been reported outside these higher-risk states as deer ticks continue to spread across the country.

Data courtesy of the Centers for Disease Control and Prevention. The map represents the victim's county of residence, not the county where exposure occurred. The animation covers 2001–2011 and should not be interpreted as current geographic risk data.