US Measles Cases Reach 5182 in 2026, Highest Annual Total Since 1991
What happened
The U.S. Centers for Disease Control and Prevention confirmed 5,182 measles cases across 45 states and Washington, D.C., marking the highest national total recorded since 1991.
The Context
* Coverage drops below herd immunity: Kindergarten vaccination rates fell from 95.2 percent in 2019–2020 to 92.4 percent in 2025–2026, creating coverage gaps that enabled cases to more than double from the 2,289 infections logged in 2025. * Demographics skew young and unvaccinated: Approximately 59 percent of all infections involve children and teenagers, with unvaccinated or status-unknown individuals accounting for 96 percent of the total caseload. * Geographic concentration and hospital strain: Outbreaks have concentrated heavily in Pennsylvania with 1,487 cases, while national hospitalizations have climbed to 562 patients, representing an 11 percent admission rate.
The Number
— Confirmed cases nationwide, demonstrating how quickly a previously eliminated airborne pathogen can resurge to alter workplace attendance and domestic travel risk profiles.
Takeaway
Expect state-level health authorities to expand targeted immunization drives and revise infection reporting protocols as federal and local agencies reconcile conflicting mortality metrics.
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