South Carolina Measles Outbreak Ends as MMR Vaccination Gains Accelerate

Health officials declared measles outbreak that began in October 2025 in South Carolina over after nearly 1,000 confirmed cases and 21 hospitalizations. No outbreak-linked cases have been reported for more than 42 days, two incubation periods, indicating transmission has stopped. The response cost about $2 million.

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The cluster added to a record year for measles in United States, joining a large West Texas outbreak. Nationwide, over 90 % of cases occurred in unvaccinated children. CDC data show 97 % of 3-year-olds received at least one MMR dose in 2025, up from 93 % in 2024—the first time in a decade the 95 % herd-immunity threshold was reached. CDC noted the survey’s sample of roughly 16,000 children is modest and that routine vaccines have not shown similar gains.

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Spartanburg County, epicenter, administered nearly double MMR doses compared with prior year; statewide distribution rose 31 % and doses to children under four surged. Officials described the effort as a “fire-break ring” around susceptible populations. The $2 million budget covered contact tracing, laboratory testing, and mobile clinics.

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Dr. Brannon Traxler, deputy director of South Carolina Department of Public Health, said vaccination combined with solid public-health work can control even most contagious viruses. CDC warned that measles cases continue to rise nationally, with 1,792 reported in 2026. Secretary Robert F. Kennedy Jr. denied that his anti-mandate stance contributed to resurgence, stating the outbreaks were unrelated to his actions. Lawmakers criticized Kennedy’s anti-vaccine rhetoric as fueling hesitancy and undermining public-health campaigns.

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CDC immunization surveys suggest an upward trend in MMR coverage, yet limited sample size and lack of parallel improvements in other vaccines create uncertainty about durability. Data for children born in 2022 who turned three in 2025 remain preliminary.

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• “Vaccination – combined with other opportunities for good, solid public health work – really can be effective, even against some of the most contagious viruses.” — Dr. Brannon Traxler, Deputy Director and Chief Medical Officer, South Carolina Department of Public Health

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• “More than anything, we’re compelled by fear. More than reason.” — Dr. Paul Offit, Director, Vaccine Education Center, Children’s Hospital of Philadelphia

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• “I’ve been saying for a couple years now that I think it was going to take a resurgence of vaccine-preventable diseases in our communities for people to really understand the benefits of vaccines and the protection that they offer.” — Dr. Josh Williams, Pediatrician, Denver Health

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• “nothing to do” — Robert F. Kennedy Jr., U.S. Secretary of Health and Human Services

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CDC will release kindergarten-entry vaccination data in coming months, offering a broader view of coverage trends. State officials plan to sustain public-health messaging, monitor school exemption rates, and stay prepared for any future measles introductions.

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