Overview
- Nationwide, roughly 2,500–2,600 confirmed measles cases have been reported in 2026, making this the largest U.S. resurgence in decades and driving intensified public‑health responses.
- Pennsylvania has seen a rapid spike, with state officials reporting 379 cases as of Friday and 89 new infections in the prior week, largely concentrated in Lancaster County where vaccination rates are low.
- Wisconsin health officials confirmed a local outbreak spanning Grant, Iowa and Lafayette counties with 41 confirmed and seven probable cases, and they are tracing contacts and urging residents to check their records.
- Hospitals issued public exposure notices after an unvaccinated patient with measles visited UPMC Children’s Hospital emergency services and after a measles‑positive individual was in Penn State Health Golisano Children’s Hospital lobby.
- Health officials say the vast majority of cases involve unvaccinated people, the MMR vaccine provides strong protection, and authorities are urging people to verify immunity, avoid clinic visits without calling first, and monitor for symptoms for up to 21 days.