For the fifth time in 16 years, Ebola virus has reared its lethal head in equatorial Africa. At press time, some 60 people in four towns in Zaire had succumbed to the virus, which causes fever, diarrhea, and, in fatal cases, a breakdown of internal organs. As before, no one knows where the virus came from or what to expect of it in the future. But another, less heralded, Ebola outbreak may provide clues to those critical questions.
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