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Measles Cases Nationwide Top 5,400 as Outbreaks Spread Across the US
Hospitalizations reached 591 as the United States recorded its worst measles outbreak in decades, with vaccination rates among kindergartners falling to 92%, officials said.
On Friday, the CDC reported 5,412 measles cases across 45 states as of November 12, marking the nation's worst outbreak in decades.
Measles cases hit a 35-year high as vaccination rates dropped from 95% in 2019 to 92% in 2026, leaving roughly 300,000 kindergartners unvaccinated.
Pennsylvania reported 6 deaths and 290 hospitalizations, contributing to 591 total national hospitalizations and 8 deaths across the outbreak, with New York and Wisconsin each recording 1.
The Pan American Health Organization may soon decide whether the United States retains its measles-free status. Thomas Lew, assistant clinical professor of Medicine at the Stanford University School of Medicine, called the deaths a "travesty of our public health system."
While two MMR doses are 97% effective at preventing infection, herd immunity requires 95% vaccination coverage. Measles remains highly contagious; a sick individual can infect 90% of unvaccinated people they contact.