More than 150 unvaccinated schoolchildren are being quarantined for 21 days in South Carolina after being exposed to measles, state officials said.
Because the students who were exposed did not have immunisations, they were forced to miss school during the period of potential disease transmission.
South Carolina is the latest US state to experience a measles surge this year after outbreaks in New Mexico and Texas where hundreds were infected and three people died.
So far this year the US has confirmed 1,563 cases, the highest level nationwide in more than 30 years, according to the Centers for Disease Control and Prevention (CDC).
The quarantined children come from two schools in Spartanburg County, South Carolina - Global Academy of South Carolina and Fairforest Elementary. One school serves primary-age children and the other serves students in primary and secondary school.
