The number of infections reached 1,136, putting the US on pace to exceed last year’s 2,281 total by springtime.
Between 1994 and 2023, the measles vaccine has prevented an estimated 85,000 deaths in the US.
Of the 979 cases, 927 are from Spartanburg County, the epicenter of the outbreak.
South Carolina has been by far the hardest-hit state this year, with 632 CDC-confirmed cases, followed by Utah (117), Florida (64), and Arizona (36).
Of the 300 measles cases, 58 have been identified in the past 3 weeks.
The South Carolina Department of Public Health announces 12 more measles cases in an ongoing outbreak.
Vermont and New York health officials are reporting their first measles cases of the year, bringing the country's total numbers of measles infections in 2026 to 910.
The perceived safety of the MMR vaccine is now 83% (down from 86%).
More than two-thirds of all cases (594) in South Carolina have occurred in children ages 5 to 17.
Preliminary data from 2025 show a drop in the number of measles cases reported across the European Union compared with 2024.
