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A horseshoe bat chasing a moth. Horseshoe bats were the source of SARS. Scientists consider bats to be a possible source of coronavirus. DE AGOSTINI PICTURE LIBRARY / Contributor

A clue to stopping coronavirus: Knowing how viruses adapt from animals to humans

Some of the world's worst diseases have come from animals. Bats, cows, camels and horses have all contributed. Now, scientists are working to know which animal introduced the new coronavirus.

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