Getting a flu shot is a good idea. This winter, though, it might not be as effective as you’d hope.
Of the early flu samples, taken between Oct. 1 and Nov. 22, less than half were good matches for this year’s formula, The Centers for Disease Control and Prevention announced Wednesday in an advisory for doctors. Flu viruses mutate over time, and the lead time needed to develop the vaccine can create a disconnect.
The flu shot is still a good idea. It will protect against some strains that are circulating and can reduce complications even among the mutated varieties.
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