Word: substrain
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Dates: during 2003-2003
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...year's vaccine was not designed to neutralize a virulent version of the Type A virus--the Fujian strain--that has surfaced in the West. But Dr. Niranjan Bhat, a flu expert at the Centers for Disease Control and Prevention, says it will still provide some protection from the substrain and is still recommended for those over 50. And it's not too late to get a shot...
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