Largest Measles Outbreak in Decades: Pennsylvania Tops 1,000
Pennsylvania’s outbreak is the largest measles outbreak in decades for a US state, with over 1,000 cases. How it compares, deaths and vaccine uptake.
US Measles Cases Top 4,000 in 45 States: Worst Since 1991
US measles cases passed 4,000 in 2026, with infections in 45 states and DC, CDC data show. The numbers, the hotspots and what the data cannot say.