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Data and Statistics


  • Cases by State, 2005-2014
  • Incidence by State, 2005-2014


  • Cases by Year, 1995-2014
  • Cases by Age and Sex, 2001-2010
  • Cases by Month, 2001-2010
  • Cases by Symptom, 2001-2010


  • Reported Lyme Disease Cases, U.S., 2014
  • Reported Lyme Disease Cases, U.S., 2013
  • Reported Lyme Disease Cases, U.S., 2012

Fast Facts

In 2014, 96% of confirmed Lyme disease cases were reported from 14 states:

  • Connecticut
  • Delaware
  • Maine
  • Maryland
  • Massachusetts
  • Minnesota
  • New Hampshire
  • New Jersey
  • New York
  • Pennsylvania
  • Rhode Island
  • Vermont
  • Virginia
  • Wisconsin

Lyme disease is the most commonly reported vectorborne illness in the United States. In 2014, it was the fifth most common Nationally Notifiable disease. However this disease does not occur nationwide and is concentrated heavily in the northeast and upper Midwest.

Lyme Disease Data File

To facilitate the public health and research community’s access to NNDSS data on Lyme disease, CDC has developed a public use dataset. This dataset provides the number of reported cases by county for the years 2000-2014. The 2000-2007 data reflect the surveillance case definition in place during that time. Data from 2008 to the present reflect the case definition which allowed for reporting of “confirmed” and “probable” cases. County codes of "999" represent “unknown” county of residence within each state. More recent case counts are not publicly available at this time.