As the summer travel season kicks into full gear, measles outbreaks in the U.S. and other countries have the Centers for Disease Control and Prevention updating its guidance to travelers.

The agency is urging all people traveling internationally to be fully vaccinated against the virus.

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Emily Smith, assistant professor in the Department of Global Studies at George Washington University, said the first problem is sustained transmission happening in the U.S., but the second issue is similar situations in other countries, such as Indonesia, Thailand and India.

“So now we’re kind of having ris

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