At least 88 new measles cases have been reported in South Carolina, as the outbreak continues to surge, with 646 infections recorded in the state since October, officials say.
State health officials say over 500 people and students in 15 schools are in quarantine after being exposed to the virus.
The outbreak - the worst since Texas reported more than 700 measles cases in 2025 - puts the US at risk of losing its measles elimination status.
Measles is one of the world's most contagious diseases, spreading through the air via coughs and sneezes, with up to 90% of unvaccinated people nearby getting infected if exposed.
South Carolina reported 88 new measles cases since last Friday, with the outbreak centred in the northwestern town of Spartanburg, home to about 39,000 people.
