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The overall effectiveness of last flu season's vaccine was only 29% because it didn't protect against a flu virus that appeared later in the season, according to the U.S. Centers for Disease Control and Prevention.
It said the vaccine was 47% effective into February, but that dropped to just 9% after the late strain showed up, the Associated Press reported.
The effectiveness of last season's vaccine was the second lowest since 2011. The vaccine for the 2014-15 flu season was only 19% effective, the AP reported.
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