Cases of babesiosis, a tick-borne illness, are on the rise throughout the northeast, according to a new report from the Centers for Disease Control and Prevention. Getty Images/Getty Images hide caption
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As white-tailed deer have returned to New England in the past century, they've brought with them tick-borne parasites that cause human diseases. marcinplaza/iStockphoto.com hide caption
Deer ticks like this one can spread a parasite that causes babesiosis. And infected people can spread it through blood donations. Jim Gathany/CDC hide caption