Lyme Disease Maps: Most Recent Year

*Incidence=confirmed cases per 100,000 persons
†Low Incidence=average incidence has not reached 10 confirmed cases per 100,000 persons for three reporting years
‡High Incidence=average incidence of at least 10 confirmed cases per 100,000 for three reporting years

Reported Cases of Lyme Disease — United States, 2019

Map of the United States showing reported cases of lyme disease.  The cases are concentrated in the north east quarter of the country.

1 dot placed randomly within county of residence for each confirmed case

Each dot represents one case of Lyme disease and is placed randomly in the patient’s county of residence. The presence of a dot in a state does not necessarily mean that Lyme disease was acquired in that state. People travel between states, and the place of residence is sometimes different from the place where the patient became infected. Many high incidence states have modified surveillance practices. Contact your state health department for more information.