Lyme Evidence Sheet
Reviewed 2026-07-24What do reported Lyme cases in my county show?
Reported county cases show how many surveillance records were published for a place and year. They are useful community context, not an estimate of one person’s risk.
What the evidence says
- The CDC public-use dataset contains aggregated Lyme disease records by year, state, and county geography.
- Published surveillance data should not be used as a personal diagnosis or risk estimate.
What this can tell you
- Whether a published county count is available for the displayed year.
- A standardized way to compare reported surveillance patterns.
What this cannot tell you
- How many infections actually occurred in a county.
- An individual’s chance of having Lyme disease.
Sources (2)
- Centers for Disease Control and Prevention. ‘Lyme Disease Public Use Aggregated Data with Geography, 2022–2023.’ https://data.cdc.gov/National-Center-for-Emerging-and-Zoonotic-Infectio/Lyme-disease-public-use-aggregated-data-with-geogr/x5j9-wybp. Accessed July 24, 2026. Open source ↗
- Centers for Disease Control and Prevention. ‘Lyme Disease Case Map.’ https://www.cdc.gov/lyme/data-research/facts-stats/lyme-disease-case-map.html. Accessed July 24, 2026. Open source ↗