The US is experiencing its worst measles outbreak in 33 years, with over 1,200 confirmed cases in 2025, exceeding the number from 2019 and approaching 1992 levels. The surge is attributed to decreased vaccination rates following the COVID-19 pandemic, increased anti-vaccine sentiment, and summer travel. Experts warn of a potential "post-herd immunity" era, emphasizing the importance of vaccination to prevent further spread. Three deaths have been reported. The situation is complicated by recent changes in federal vaccine policy.

Prepared by Olivia Bennett and reviewed by editorial team.