Oct. 13 (UPI) -- At least 153 unvaccinated students at two northern South Carolina schools exposed to measles are being quarantined for 21 days, state health officials said. The students, because they didn't have immunity, will be excluded from school until the potential disease transmission period has ended, the South Carolina Department of Health Education said in a video briefing Thursday . The schools affected are in Spartanburg County: Global Academy and Fairforest Elementary School. The