CHICAGO, Feb 22: A US government analysis of this season’s flu vaccine suggests it was effective in only 56 percent of people who got the shot, and it largely failed to protect the elderly against an especially deadly strain circulating during flu season. The US Centers for Disease Control and Prevention said the findings underscore the need for more effective weapons in the fight against influenza, which kills between 3,000 and 50,000 people in the United States each year depending on the severity of the flu season. (agencies)
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