More people have been infected in the U.S. during the first four months of 2014 than have been infected in the first four months of the past 18 years.
Health officials say 13 outbreaks and 129 cases have been recorded so far this year.
California is reporting the highest numbers, with 58 cases.
The CDC says many of the California cases are a result of people visiting the Philippines, which is experiencing a very large measles outbreak.
The CDC says the last time there was a reported death from measles in the U.S. was in 2005.
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