Recent Surveillance Data

In 2018, a total of 33,666 confirmed and probable cases of Lyme disease were reported to CDC, 21% less than in 2017. 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 415 in 2018.