US measles cases hit 3,294 in 2026, the worst in decades. Pennsylvania reports 693 cases and 4 deaths. CDC data, state breakdowns, and MMR vaccine facts.
Measles Outbreak 2026: 3.2K US Cases, Pennsylvania Deaths Rise
US measles cases hit 3,294 in 2026, the worst in decades. Pennsylvania reports 693 cases and 4 deaths. CDC data, state breakdowns, and MMR vaccine facts.