Mar 11, 2025 · Explore the interactive map of reported Lyme disease cases over time by county of residence. Cases are reported from the infected person’s county of residence (where known), not necessarily the place where they were infected.

Mar 13, 2025 · Over 89,000 cases of Lyme disease were reported to CDC by state health departments and the District of Columbia in 2023. This number reflects cases reported through routine national surveillance, which is only one way public health officials track diseases.

Approximate Risk Map for Lyme Disease Transmission in California and the U.S. Note: Darker color indicates higher risk. This map is based on an understanding of where Lyme disease cases are reported and where blacklegged ticks are known to occur.

General information on Lyme disease including prevention and what to do after a tick bite. Information on the signs and symptoms of Lyme disease. Borrelia bacteria are spread to people through the bite of an infected blacklegged tick. ... Available Lyme disease data including how many people get Lyme disease, and where.

Interactive story map providing maps, data, and information about Lyme disease in California

People get Lyme disease when biten and fed on by an infected western blacklegged tick (Ixodes pacificus). commonly in areas shown in green on map. Dark green counties show where reported Lyme disease cases most often had exposure.

Below, you’ll find the facts about Lyme disease and the information you need to know. The CDC has long recognized that the number of cases of Lyme disease reported to CDC is significantly less than the actual number of cases.

Interactive story map providing maps, data, and information about Lyme disease in California

Current map: Total Lyme Disease Cases Reported by CDC 1990–2022. Click a state to view yearly history. (Trouble viewing? Allow page to load first.) Printer-friendly map (PDF) High resolution map (GIF) Compiled data: Total Lyme Cases Reported by …

Jan 22, 2021 · A team of CDC researchers recently constructed the first map to reveal county-level distribution of host-seeking vector ticks carrying the bacteria that causes Lyme disease.