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Carson, who is considering a run for president, tells NPR that science has proven the efficacy of vaccines, so "why would you even think about not doing it?"
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It happened to Roald Dahl's daughter in 1962. It still happens today, in the U.S. and around the world. In rare cases, measles becomes an incurable disease.
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The latest wave of measles cases and potential infections is in Arizona, where 1,000 people may have been exposed to measles from seven people confirmed to have been infected.
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Parents who refuse to have their children vaccinated live near others who do the same, a study finds. That increases the risk that children will become infected, even if they've had their shots.
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An outbreak among visitors to two California theme parks shows once again that this supercontagious virus doesn't respect borders. Most of the afflicted people had not been vaccinated.