It's not just kids going unvaccinated. Only 20 percent of U.S. adults have had an updated Tdap vaccine or a pneumococcal vaccine, and fewer than half got a flu shot in 2014.

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It's not just kids going unvaccinated. Only 20 percent of U.S. adults have had an updated Tdap vaccine or a pneumococcal vaccine, and fewer than half got a flu shot in 2014.