Tickborne Disease Surveillance Data Summary
In 2019, state and local health departments reported 50,865 cases of tickborne disease to CDC.
|Reported Tickborne Diseases, U.S.||2016||2017||2018||2019|
|Lyme Disease (confirmed and probable)||36,429||42,743||33,666||34,945|
|Spotted Fever Rickettsiosis§||4,269||6,248||5,544||5,207|
For more detailed data about each disease, including state totals, see the Notifiable Infectious Diseases and Conditions Annual Data Tables.
For more information about increasing numbers of infections from mosquito, tick, and flea bites, see the May 2018 issue of Vital Signs.
Total Reported Cases of Tickborne Disease, 2004–2019
|Total Tickborne Disease Cases||22,527||26,800||23,770||31,808||39,993||42,649||34,890||40,795||40,119||46,231||43,654||49,825||48,610||59,349||47,743||50,865|
Abbreviations: N = not notifiable
* Unless stated otherwise, all cases reported from continental U.S., Hawaii, and Alaska
† Anaplasmosis and ehrlichiosis were reported separately after 2008 but are combined here for the entire period.
§Includes R. rickettsii, R. parkeri, R. species 364D
§§ Babesiosis surveillance data are reported independently to different CDC programs. For this reason, surveillance data reported elsewhere might vary slightly from data reported in this summary