The fast-growing measles outbreak in South Carolina is now the largest in the United States since the illness was declared eliminated in this nation greater than twenty years in the past.
With 789 instances reported as of Tuesday, the South Carolina outbreak surpassed a large outbreak in Texas, which reached 762 instances earlier than it ended in August final yr. Two youngsters died throughout the outbreak in Texas.
South Carolina, which first reported instances in October, has added greater than 600 instances in 2026 alone. At least 18 folks – adults and youngsters – have been hospitalized for problems of measles, the state well being division mentioned Tuesday, and no deaths have been reported.
There are an extra 557 folks in quarantine in South Carolina, which means they might have been uncovered to measles and don’t have immunity to it by vaccination or prior an infection. The well being division reported exposures at three further colleges Tuesday, on high of current quarantines amongst college students at 20 others.
Cases in North Carolina, Washington and California have additionally been linked to the South Carolina outbreak.
Measles was declared eliminated in the US in 2000, which means there has not been steady transmission for greater than a yr at a time.
Before 2025, there have been a median of about 180 measles instances reported annually since elimination, based on US Centers for Disease Control and Prevention knowledge. The US reported greater than 2,200 confirmed measles instances in 2025 — considerably greater than there have been in any yr since 2000.
The CDC said on Friday that there have been 416 confirmed measles instances reported in the US thus far in 2026, however its replace included knowledge up till Thursday, earlier than South Carolina’s newest numbers got here in. At least 14 states have reported a confirmed measles case thus far this yr, and one other massive outbreak continues to develop alongside the Arizona-Utah border.
The unfold of measles over the previous yr has left the US at risk of losing elimination status, which the Pan American Health Organization might resolve to revoke when it meets in April.
The CDC beforehand called measles elimination “a historic public health achievement,” potential in massive half due to vaccination.The measles vaccine was licensed in 1963 and the mix measles-mumps-rubella (MMR) vaccine that is mostly used first grew to become broadly obtainable in the US in the Nineteen Seventies.
Previously, the nation’s elimination standing was threatened in 2019, amid large outbreaks in New York concentrated in Orthodox Jewish communities in Brooklyn and Rockland County.
The US Department of Health and Human Services mentioned that it’s supporting the measles response in South Carolina by offering $1.4 million in requested support. The company additionally mentioned that the CDC is working intently with state well being officers to analyze measles transmission patterns and in common coordination conferences.
But the federal authorities’s posture towards measles has modified below HHS Secretary Robert F. Kennedy Jr., a longtime vaccine skeptic. The division says vaccination is the simplest solution to stop measles, however Kennedy has additionally centered on unconventional treatments, together with vitamin A, a steroid and an antibiotic.
CDC Principal Deputy Director Dr. Ralph Abraham, a former Louisiana surgeon normal who ended some vaccine promotion in his state earlier than taking his new put up late final yr, argued final week that ongoing measles transmission from the Texas outbreak, which began in January 2025, has not been proved.
Nonetheless, Abraham mentioned the lack of measles elimination standing would “not really” be vital.
“It’s just the cost of doing business with our borders,” Abraham advised reporters in a briefing. “We have these communities that choose to be unvaccinated. That’s their personal freedom.”
Abraham added that “vaccination remains the most effective way to prevent measles” and mentioned the CDC is “here to help,” however they’re keen to hearken to alternate options “for treatment and prevention.”
The overwhelming majority of instances in the South Carolina outbreak are amongst youngsters, almost all of whom weren’t absolutely vaccinated with the really helpful two doses of MMR vaccine. Of the 789 instances reported as of Tuesday, greater than 700 weren’t vaccinated or had not obtained the 2 really helpful MMR doses, the well being division mentioned.
State well being officers have been encouraging vaccination, together with by facilitating cellular well being unit vaccination occasions, to attempt to comprise the outbreak.
In Spartanburg County, the epicenter of the outbreak, 90% of scholars had required immunizations in the 2024-25 faculty yr, among the many lowest vaccination charges in the state, based on state data – with some colleges there reporting a lot decrease charges. Public well being specialists say a 95% vaccination charge is sometimes wanted to maintain measles from spreading in a neighborhood as a result of the virus is so contagious.
The MMR vaccine is broadly obtainable at docs’ workplaces, pharmacies and well being departments, and is free for a lot of households by the Vaccines for Children program or medical health insurance, State Epidemiologist Dr. Linda Bell mentioned final week.
“As we continue to watch this daily surge in cases, [the Department of Public Health] strongly encourages those who are not protected to take advantage of the opportunity to get protected against unexpected exposures and illnesses now to help us stop this outbreak and to help us protect our communities,” Bell mentioned.