Pennsylvania measles case: Four fully vaccinated people test positive, DOH says

Key Points:

• Pennsylvania has identified four breakthrough measles cases in fully vaccinated individuals during the ongoing outbreak, marking the first such cases; these patients, including three adults and one child, were not hospitalized.
• The state has confirmed 676 measles cases across 37 counties with 124 hospitalizations and two deaths since late April, with over 99% of cases in unvaccinated people.
• Measles is highly contagious, with symptoms appearing 7–21 days after exposure, and can cause serious complications requiring hospitalization in up to 20% of cases.
• Pennsylvania's Department of Health is actively responding with vaccination efforts, administering thousands of MMR doses through pop-up clinics and health centers, leading to a significant increase in vaccinations.
• Schools in Pennsylvania maintain high vaccination rates, providing strong community immunity, and health officials emphasize that two doses of MMR vaccine remain the best protection against measles.