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US measles cases top 4,400, far exceeding last year’s totals

The outbreak has led to 451 hospitalizations, with about 96% of cases in people who are unvaccinated or whose status is unknown, the CDC said.

  • On Friday, the Centers for Disease Control and Prevention reported 4,410 measles cases nationwide as of October 15, an increase of 330 from the previous week across 45 states and Washington, D.C.
  • Vaccination rates have lagged in recent years, with CDC data showing about 96% of cases occurring among people who are unvaccinated or have unknown vaccination status.
  • Pennsylvania has reported 1,260 measles cases this year as of October 16, with state health officials recording six measles-related deaths during the significant outbreak.
  • Health Secretary Robert F. Kennedy Jr. confirmed federal support for Pennsylvania on Thursday after the state requested a CDC Epi-Aid, a rapid field investigation for urgent health problems.
  • Epidemiologist John Brownstein warned that the resurgence threatens decades of public health gains, emphasizing that two doses of the MMR vaccine are 97% effective against measles.
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USA Today broke the news in New York, United States on Friday, October 16, 2026.
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