A HuffPost health article explains which adults may need a measles booster amid a 30-year-high 2,289 U.S. cases in 2025, up from 285 in 2024. Citing doctors, it says adults vaccinated between 1963 and 1967 may need another dose, two MMR doses are about 97% effective, and those without records can safely get a booster or check state registries.