South Carolina measles outbreak reaches 789 cases

South Carolina's measles outbreak has reached 789 confirmed cases, and 557 people are under 21-day quarantine.

South Carolina's measles outbreak has grown to 789 reported cases, state health officials said. The majority of cases remain centered in Spartanburg County and involve people who were unvaccinated or did not know their vaccination status. Health authorities report 557 people are under quarantine for 21 days. Cases connected to the South Carolina outbreak have been documented in other states. Key details: - At least 789 confirmed cases have been reported, surpassing a 2025 West Texas outbreak that sickened 762 people. - Health officials say 557 people across the state are in 21-day quarantine orders. - Most cases are concentrated in Spartanburg County and involve children and teenagers; at least 23 schools have students in quarantine. - Linked cases have been identified in California, North Carolina (reported 14 cases), Washington and probable cases in Ohio; Union County, North Carolina reported more than 170 people quarantined tied to a private school with a low documented vaccination rate. - Federal data cited in reports show a larger national context, including 2,255 U.S. measles cases in 2025 and a high proportion of patients who were unvaccinated. Summary: The outbreak has expanded rapidly and remains centered in Spartanburg, with hundreds quarantined under 21-day orders and linked cases reported in multiple states. Public health teams have deployed mobile clinics and are tracking exposures while quarantine measures continue. The potential for the U.S. to lose its measles elimination status has been raised if transmission persists for a full year.