2026 has already become the worst year for measles in the United States since 1991.

Measles Outbreak Escalates: U.S. Faces Worst Year Since 1991. As 2026 unfolds, the United States grapples with a severe measles resurgence, marking the highest case count in over three decades. Health officials report a rapid increase in outbreaks across multiple states, attributing the surge to declining vaccination rates and increased travel. The Centers for Disease Control and Prevention (CDC) emphasizes the necessity of immunization, urging parents to ensure their children receive the MMR (measles, mumps, rubella) vaccine. Public health campaigns are intensifying efforts to educate communities on the importance of herd immunity. With measles being highly contagious, experts warn that without swift action, the situation could worsen, posing a significant threat to public health nationwide.