That's a major step in understanding how the deadly virus got to humans there.
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Doctors had long suspected bats were a carrier -
They're commonplace in West Africa, and even a source of food.
Meantime, the current outbreak in Congo has notched its worst day yet, with 14 new cases.
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9 were in a large city just across the border from Rwanda.
Overall, more than 700 have been sickened since August.
More than 400 have died and health officials fear the outbreak is about to spread to Rwanda and Uganda.