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Tickborne Disease Surveillance Data Summary

In 2017, state and local health departments reported a record number of cases of tickborne disease to CDC, 59,349 cases, up from 48,610 in 2016.

Reported Tickborne Diseases, U.S. 2016 2017
Reported Tickborne Diseases, U.S.
Lyme Disease (confirmed and probable) 36,429 42,743
Anaplasmosis/Ehrlichiosis 5,750 7,718
Spotted Fever Rickettsiosis§ 4,269 6,248
Babesiosis§§ 1,910 2,368
Tularemia 230 239
 Powassan virus 22 33
 Total 48,610 59,349 

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, 2004–2017

Graph showing total tickborne disease cases in the U.S. and territories from 2004 to 2017.

Reported cases of confirmed and probable Lyme disease, anaplasmosis/ehrlichiosis, spotted fever rickettsiosis (including Rocky Mountain spotted fever), babesiosis, tularemia, and Powassan virus disease all increased between 2016 and 2017.

Reported cases of confirmed and probable tickborne diseases from 2004 to 2017
Year 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
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

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

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