US measles outbreaks keep building as public health teams chase transmission

Published by Albis · 30 May 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.