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Many US Measles Cases Are in People Who Refuse Vaccines

Many U.S. measles cases occur in children whose parents refuse vaccines for religious or philosophical reasons, a new study suggests.

Researchers analyzed 18 previous studies of measles in the U.S. and found that about 1,400 measles cases occurred in the United States from 2000 to 2015. More than half of these cases (57 percent) occurred in people who were definitely not vaccinated against measles, and another third of the cases were in people who had an “unknown history” of vaccination. This means that the researchers could not tell definitively whether these individuals were vaccinated.