More than 130 unvaccinated students at two schools in South Carolina are being quarantined after they were exposed to measles, amid an ongoing outbreak in the state—a sign, public health experts warn, that cases could continue to rise this school year.

On Tuesday, the South Carolina Department of Public Health confirmed the 16th case of measles in the state so far this year. Last week, public health officials said in a media briefing that more than 100 unvaccinated students at Global Academy and Fairforest Elementary School were exposed to measles and would be excluded from school for 21 days, which is when the period of potential disease transmission has ended.

Of the 16 cases in the state, five are people who were exposed in school settings and have been quarantining at home over t

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