Is SARS Getting Deadlier?

The SARS epidemic may be waning in some of its hot zones in the world, but scientists aren't ready to put away their petri dishes and declare victory yet. They know, through long experience trying to eradicate AIDS and other persistent diseases, that pathogens like the mutated coronavirus believed to cause SARS are full of surprises—and that most are nasty ones.

Just last week, for example, the World Health Organization (WHO) announced the disturbing disclosure that SARS may be far deadlier than previously believed. A growing body of statistical evidence now indicates that about one out of every...

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