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 2018. Cases are concentrated in the north east region of the country.

Map of the United States showing reported cases of Lyme Disease 2017. Cases are concentrated in the north east region of the country.

Map of the United States showing reported cases of Lyme Disease 2016. Cases are concentrated in the north east region of the country.

Map of the United States showing reported cases of Lyme Disease 2015. Cases are concentrated in the north east region of the country.

Map of the United States showing reported cases of Lyme Disease 2014. Cases are concentrated in the north east region of the country.

Map of the United States showing reported cases of Lyme Disease 2013. Cases are concentrated in the north east region of the country.

Map of the United States showing reported cases of Lyme Disease 2012. Cases are concentrated in the north east region of the country.

Map of the United States showing reported cases of Lyme Disease 2011. Cases are concentrated in the north east region of the country.

Map of the United States showing reported cases of Lyme Disease 2010. Cases are concentrated in the north east region of the country.

Map of the United States showing reported cases of Lyme Disease 2009. Cases are concentrated in the north east region of the country.

Map of the United States showing reported cases of Lyme Disease 2008. Cases are concentrated in the north east region of the country.

Map of the United States showing reported cases of Lyme Disease 2007. Cases are concentrated in the north east region of the country.

Map of the United States showing reported cases of Lyme Disease 2006. Cases are concentrated in the north east region of the country.

Map of the United States showing reported cases of Lyme Disease 2005. Cases are concentrated in the north east region of the country.

Map of the United States showing reported cases of Lyme Disease 2004. Cases are concentrated in the north east region of the country.

Map of the United States showing reported cases of Lyme Disease 2003. Cases are concentrated in the north east region of the country.

Map of the United States showing reported cases of Lyme Disease 2002. Cases are concentrated in the north east region of the country.

Map of the United States showing reported cases of Lyme Disease 2001. Cases are concentrated in the north east region of the country.