A sampling of flu cases so far this season suggests the current flu vaccine may not be a good match for the seasonal flu strain currently circulating in the United States, the U.S. Centers for Disease Control and Prevention on Wednesday.
The U.S. health agency issued a health advisory to doctors noting that flu virus samples the agency took from Oct. 1 through Nov. 22, showed that just under half were a good match for the current influenza A flu strain contained in the current H3N2lu shots for 2014-2015, suggesting the virus has drifted.
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