The federal government has confirmed more than 100 people across 14 states have now developed measles. Public health officials suspect the outbreak, which is concentrated in California, began when an infected person visited Disneyland in Anaheim in December. In recent years, a growing number of parents have opted not to have their children vaccinated, claiming a link between vaccines and autism. The prestigious medical journal Lancet published a study in 1998 showing such a link, but the study was later retracted and has been widely discredited. According to the Centers for Disease Control and Prevention, one in 12 children born in the United States is not receiving their first dose of MMR (measles, mumps and rubella) vaccine on time. Several potential Republican presidential candidates have weighed in on the debate. Sen. Rand Paul of Kentucky, an ophthalmologist, said he had heard of instances where vaccines caused "mental disorders." New Jersey Gov. Chris Christie said vaccinating kids is a matter of "parental choice."
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