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The hunt for a future killer

One morning seven years ago, Tony Goldberg was working in the tropical forests of Uganda’s Kibale National Park, when a colleague arrived at his research station with two students in tow. They were searching for bats. Goldberg, a University of Wisconsin-Madison professor of epidemiology, had been visiting the station for several years, long enough to have noticed the jet-black figures that fluttered away from the kitchen building whenever he disturbed their daytime sleep.