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CDC Study: Measles making comeback

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A virus once eliminated in the U.S. is making a major comeback.

According to a new CDC study, measles cases hit a 15-year high in 2011.

Officials say there were 17 outbreaks nationwide, with 222 people infected.

Scientists say the measles is usually introduced by people who travel internationally, and those who are not vaccinated are at a much higher risk.