This season's flu shot was 36 percent effective overall, far less than the 2016-2017 vaccine but still worth getting because it can help ward off serious complications, US health officials said Thursday. The interim report from the US Centers for Disease Control and Prevention was released in the final weeks of the current flu season, which has been the most active since the swine flu pandemic of 2009. Last season's flu vaccine was apparently better -- 48 percent effective overall and 32 percent effective in the United States against the most common (A)H3N2 strain.
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