Americans are increasingly being exposed to false claims about measles and vaccines, according to a new KFF poll.

It found 33 percent of respondents had “heard” or “read” the false claim that “getting the measles vaccine is more dangerous than becoming infected with measles.” Last March, 18 percent said they had heard the same claim.

The poll found the percentage of people believing the unproven claim that “the measles, mumps, rubella vaccines,........

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