US measles outbreaks keep building as public health teams chase transmission
Last updated May 30, 2026
CDC data show 1,983 confirmed US measles cases in 2026, with 93% linked to outbreaks, while a California county’s response shows how fast local health systems have to move to stop spread
- Large outbreak growth in the US highlights vaccine-coverage and public-health resilience problems with international relevance.
- Public-health transmission chain.
- The United States had 1,983 confirmed measles cases reported to the CDC in 2026 as of May 28, according to the agency’s latest update.
- The cases were reported across 40 jurisdictions, with another nine cases reported among international visitors to the United States.
- Most of the confirmed cases are tied to outbreaks.
Still unclear: What local readers are seeing from the ground
Based only on supplied evidence from CDC and Governing/KFF Health News. Case totals reflect CDC data reported as of May 28, 2026; future counts may change as jurisdictions update reports.
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