CDC surveillance explorer
Reported Lyme cases by county
Search a county or state, then read the context that keeps the data from being mistaken for personal risk.
Reported cases are not a personal-risk estimate.
Counts reflect reports assigned to a person’s county of residence. They do not include every infection, show where a bite occurred or measure your individual risk.
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How to read the map
The blank spaces carry uncertainty, too.
- Suppressed or missing county data are shown as no published value—not zero.
- Reporting practices and the 2022 surveillance case definition affect comparisons.
- More reported cases can reflect population size, testing and reporting as well as transmission.