Volume 21, Number 8—August 2015
Dispatch
Geographic Distribution and Expansion of Human Lyme Disease, United States
Figure

Figure. United States counties with high incidence of Lyme disease by the period when they first met the designated high-incidence criteria, 1993–2012. High-incidence counties were defined as those within a spatial cluster of elevated incidence and those with >2 times the number of reported Lyme disease cases as were expected (based on the population at risk).