Tick Populations Expanding, More at Risk

The first survey since 1998 shows that ticks that cause Lyme disease are now established in twice the number of counties they were in 1998.

January 18, 2016
9:00 AM EST
The top map shows distribution of ticks in the United States from 1907–1996. The bottom map shows counties classified as established (red or green) for a given tick species had at least six ticks or two life stages recorded within a single calendar year. Counties with fewer ticks of a single life stage were classified as reported (blue or yellow) for the tick species. | Dennis et al. 1998/CDC


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