Measles in South Carolina has spread to at least 789 people, surpassing the 2025 West Texas outbreak that sickened 762 people and killed two young girls. The majority of cases remain centered in Spartanburg County, mostly among people who were either unvaccinated or didn't know their status, the South Carolina Department of Public Health reported Tuesday. There have been 89 new cases confirmed since Friday, indicating that the outbreak isn't under control. Health officials said that 557 people are in quarantine for 21 days. The South Carolina outbreak began this past fall. By January, cases directly linked to the state had been documented in California, North Carolina and Washington.