Nearly half of babies and toddlers in the United States aren't getting recommended vaccines on time, according to a study - and if enough skip vaccines, whole schools or communities could be vulnerable to diseases such as whooping cough and measles.
"What we're worried about is if (under-vaccination) becomes more and more common, is it possible this places children at an increased risk of vaccine-preventable diseases?" said study leader Jason Glanz, with Kaiser Permanente Colorado in Denver.
"It's possible that some of these diseases that we worked so hard to eliminate (could) come back."
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