Data and Surveillance

Possible cases of Lyme disease are reported to state and local health departments by health care providers and laboratories. State health departments classify cases according to standard criteria outlined in the Lyme disease case definition and report confirmed and probable cases to CDC. The extent of case investigations varies by state. Investigations are often dependent on available resources and staff time. Some states describe their surveillance methods in detail on their health department website.

Each year, approximately 30,000 cases of Lyme disease are reported to CDC by state health departments and the District of Columbia. However, this number does not reflect every case of Lyme disease that is diagnosed in the United States every year. Standard national surveillance is only one way that public health officials can track where a disease is occurring and with what frequency. Recent estimates using other methods suggest that approximately 300,000 people may get Lyme disease each year in the United States.

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

Reported Cases of Lyme Disease - United States, 2017

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

Reported Cases of Lyme Disease - United States, 2016

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

Reported Cases of Lyme Disease - United States, 2015

Map of the U.S. showing reported cases of Lyme Disease for the year 2014.

Reported Cases of Lyme Disease - United States, 2014

Reported Cases of Lyme Disease 2013

Reported Cases of Lyme Disease - United States, 2013

Reported Cases of Lyme Disease 2012

Reported Cases of Lyme Disease - United States, 2012

Reported Cases of Lyme Disease 2011

Reported Cases of Lyme Disease - United States, 2011

Reported Cases of Lyme Disease 2010

Reported Cases of Lyme Disease - United States, 2010

Reported Cases of Lyme Disease 2009

Reported Cases of Lyme Disease - United States, 2009

Reported Cases of Lyme Disease 2008

Reported Cases of Lyme Disease - United States, 2008

Reported Cases of Lyme Disease 2007

Reported Cases of Lyme Disease - United States, 2007

Reported Cases of Lyme Disease 2006

Reported Cases of Lyme Disease - United States, 2006

Reported Cases of Lyme Disease 2005

Reported Cases of Lyme Disease - United States, 2005

Reported Cases of Lyme Disease 2004

Reported Cases of Lyme Disease - United States, 2004

Reported Cases of Lyme Disease 2003

Reported Cases of Lyme Disease - United States, 2003

Reported Cases of Lyme Disease 2002

Reported Cases of Lyme Disease - United States, 2002

Reported Cases of Lyme Disease 2001

Reported Cases of Lyme Disease - United States, 2001