The Centers of Disease Control and Prevention (CDC) have warned doctors that flu vaccines may not be effective against the most common strain of flu circulating in the U.S..
According to Reuters, the U.S. health agency issued an advisory to doctors Wednesday saying that of the flu samples they had taken between October 1 and November 22, less than half were good matches for the current flu shots.
The flu shots will still protect against certain strains of the flu, and can help reduce the risk of complications even among the strains that have mutated.
[Reuters]
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