Measles is among the most contagious diseases in the world, and case counts in the United States are ticking up.
NBC News is tracking confirmed measles cases across the country with data from state health departments.
Measles cases in the United States are the highest they’ve been since the country eliminated the disease in 2000. The U.S. has reported more than 1,500 cases since the start of the year.
Most cases this year are in Texas, which accounts for about 1 out of 2 reported infections.
“Elimination” means the disease has not spread continuously for at least 12 months. And while sporadic outbreaks have occurred since 2000, recent case counts are nothing compared with the 27,000 cases reported in 1990 or the 450,000 cases reported in 1964.
The measles vaccine was introduced in 1963, which marked a turning point for the contagious disease, which used to kill thousands every year.
CORRECTION (July 28, 2025, 11:20 a.m. ET): Because of a data entry error, a previous version of this article misstated measles cases in South Carolina and South Dakota. The totals in both states have been updated.
CORRECTION (Oct. 9, 2025, 4:17 p.m. ET): A previous version of this article misstated the number of measles cases in Missouri and Florida. The totals in both states have been updated.
