Recent Surveillance Data

In 2017, a total of 42,743 confirmed and probable cases of Lyme disease were reported to CDC, over 17% more than in 2016. The geographic distribution of high incidence areas with Lyme disease appears to be expanding based on data reported to National Notifiable Disease Surveillance System (NNDSS). The number of counties with an incidence of ≥10 confirmed cases per 100,000 persons increased from 324 in 2008 to 454 in 2017.