A map released by the Yale School of Public Health shows which indicates areas of the eastern United States where people have the highest risk of contracting Lyme disease based on data from 2004-2007.
Researchers dragged sheets of fabric through the woods to snag ticks for the survey.
The map shows a clear risk across much of the Northeast, from Maine to northern Virginia.
Researchers at Yale University also identified a high-risk region across most of Wisconsin, northern Minnesota and a sliver of northern Illinois.
Areas highlighted as "emerging risk" regions include the Illinois-Indiana border, the New York-Vermont border, southwestern Michigan and eastern North Dakota.