Lyme Disease Maps: Most Recent Year
*Incidence=confirmed cases per 100,000 persons
†Low Incidence=average incidence of less than 10 confirmed cases per 100,000 persons for previous three reporting years
‡High Incidence=average incidence of at least 10 confirmed cases per 100,000 persons for previous three reporting years
Reported Cases of Lyme Disease — United States, 2017
1 dot placed randomly within county of residence for each confirmed case
In 2016, Massachusetts transitioned to a surveillance method that relies primarily on laboratory reports. This method does not currently align with the national surveillance case definition as set by the Council of State and Territorial Epidemiologists (CSTE). Therefore, information on most Lyme disease cases occurring in Massachusetts is not sent to CDC. Please contact the MA Department of Public HealthExternal for case numbers.