A newly identified coronavirus that has killed seven of its 13 known victims was rapidly characterized by scientists worldwide who sequenced part of its genome, found it readily infects humans cells and discovered it may respond to medicines used to treat SARS. However, the remaining unanswered questions may be the most important, such as the identity of the reservoir animal and the epidemiology of exposure in humans. "What we know really concerns me, but what we don't know really scares me," said Michael Osterholm, who directs the Center for Infectious Disease Research and Policy.

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