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Young and the old. why adults 20 years and older, why are they getting hit so hard? >> well, some of them simply have an uncertain measles vaccination history and thats why if youre traveling abroad and you cant document what happened in the past, youll get a measles vaccine before you travel abroad. be protected and then you wont also bring measles back into the united states. >> doctor, really kind of bottom line. how big of a problem do you think this is? is this going to be one year when you...