Image: White-footed mice are efficient transmitters of Lyme disease in the Northeast. They infect up to 95 percent of the ticks that feed on them. But it's people who create the conditions for Lyme outbreaks by building homes in the animals' habitat. Stephen Reiss/for NPR

npr.org - March 6th 2017 - Michaeleen Doucleff, Jane Greenhalgh

Last summer Felicia Keesing returned from a long trip and found that her home in upstate New York had been subjected to an invasion.

"There was evidence of mice everywhere. They had completely taken over," says Keesing, an ecologist at Bard College.

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