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Even if all these measures fail to eliminate SARS quickly or completely, they should at least minimize the danger. "People should be concerned," says Ostroff. "But I don't think they should be alarmed." The minuscule murderer in Dr. Nicholls' microscope sights is still potentially deadly. But it no longer looks like the monster it appeared to be just a few weeks ago. --Reported by Jim Erickson, Carmen Lee and Bryan Walsh/Hong Kong, Sora Song/New York, Matthew Forney/Beijing and Daffyd Roderick/Toronto