Researchers have confirmed that blacklegged ticks, or deer ticks, were found in nine eastern national parks, from Virginia to Maine. These ticks were carrying Lyme disease, as well as a host of other diseases. To best determine actual risk for visitors, all the ticks were taken from the edges of frequently used trails.

“This study reminds us of the importance of avoiding tick bites by using insect repellent with 20 percent to 30 percent DEET when in wooded areas,” says Laura Tavarez, M.D., of Southern Ocean Medical Center. “You can also reduce your risk by walking in the middle of trails and avoiding areas with high grass or brush.”