This season's flu vaccine was no match for the bug that popped up near the end

This season's vaccine was one of the least effective in recent years.

This season's shot turned out to be a mismatch against the bug that showed up late.

That pushed down the overall effectiveness to one of the lowest in recent years. Since 2011, the only season with a lower estimate was the winter of 2014-2015, when effectiveness was 19 percent. A mismatch was also blamed then. Vaccines against some other infectious diseases are not considered successful unless they are at least 90 percent effective. But flu is particularly challenging, partly because the virus can so quickly change. Overall, flu vaccine has averaged around 40 percent.

age 6 months or older. Officials say the vaccine is still worthwhile since it works against some strains, and it likely prevented 40,000 to 90,000 hospitalizations over the winter flu season.FOLLOW

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