Who Should Worry About Measles Right Now, According to Doctors

Key Points:

• The U.S. is experiencing a worsening measles outbreak in 2026, with 3,294 confirmed cases across 47 states, and Pennsylvania reporting 731 cases, 4 deaths, and 141 hospitalizations, mostly among unvaccinated individuals.
• Infants under 12 months, unvaccinated pregnant people, and immunocompromised individuals are most vulnerable to severe measles complications due to their limited immunity or inability to receive the live MMR vaccine.
• People who have received two doses of the MMR vaccine or were born before 1957 are generally protected, though in outbreak areas, vaccination can be given as early as six months to enhance protection.
• Measles is a serious disease that can cause severe complications such as pneumonia, encephalitis, death, and immune amnesia, which increases susceptibility to other infections; public misunderstanding of its severity is a concern among health experts.
• Health officials urge unvaccinated individuals or those unsure of their vaccination status to get the MMR vaccine promptly, and to notify healthcare providers before visiting if measles symptoms appear, to prevent further spread.