Flu Shots: Influenza A (H3N2) virus drift affecting vaccination effectiveness


The flu shot this year

may not be as effective as originally thought as the major circulating strain this year has mutated to the point reduced protection is being provided.

In past seasons during which predominant circulating influenza viruses have been antigenically drifted, decreased vaccine effectiveness has been observed. However, vaccination has been found to provide some protection against drifted viruses.


That means it is still worth getting if you haven’t already.


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