Measles: South Carolina nears official end while Utah leads U.S. outbreaks

South Carolina reported no new measles cases and is approaching the required 42-day period to declare an end to a 997-case outbreak; Utah now has the largest active outbreak in the U.S., with 583 cases and 24 new cases in the past five days.

South Carolina reported no new measles cases this week as public health officials move toward formally closing a large outbreak that began October 2, 2025. The state has recorded 997 cases, many among school-aged children, and officials say there have been no new cases since March 17. Health authorities noted there are currently no people in quarantine or isolation in South Carolina and that a 42-day period without new cases is required to declare the outbreak over. Meanwhile, Utah now has the largest active measles outbreak in the United States, and international health officials are reporting growing activity in Bangladesh. Key points: - South Carolina reported no new cases and no people in quarantine or isolation; the state has 997 total cases and officials say 42 days without new cases are required to declare an end to the outbreak, which would put the last day at April 26 if no new cases appear. - Of the South Carolina cases, most were among children and the large majority were reported as unvaccinated; no new case has been recorded there since March 17. - Utah has the most active U.S. outbreak with 583 reported cases after 24 new cases were recorded in the past five days, and officials report 47 hospitalizations linked to the outbreak. - Bangladesh is reporting a rapidly growing outbreak with over 900 cases and more than 100 child deaths reported; officials announced a mass vaccination campaign for infants starting this week. Summary: South Carolina is approaching the formal end of its 997-case measles outbreak if its 42-day no-new-case period is completed, with the current projected last day of the outbreak on April 26 if no additional cases are reported. Utah is now the most active U.S. outbreak, with recent increases in cases and reported hospitalizations; next steps for that outbreak were not detailed in the report. Internationally, Bangladesh has reported widespread activity and officials announced a planned large-scale infant vaccination campaign this week.