An NBC News data investigation with Stanford, part of "The Vaccine Divide," reports that measles, eliminated in the United States in 2000, has returned through falling vaccination rates: 75% of counties with kindergarten data are below the herd-immunity threshold, and the CDC counts 43 outbreaks, more than 5,000 cases, and eight deaths in 2026, with outbreaks spreading among mostly unvaccinated Amish families in Pennsylvania. A Pan American Health Organization commission is weighing whether the United States has lost its measles-elimination status, which experts expect it to revoke, while HHS says Secretary Robert F. Kennedy Jr. still recommends MMR vaccination.