US Measles Cases Reach Highest Level in 35 Years as Vaccination Gaps Widen
National surveillance reveals measles incidence at 35-year highs tied to vaccination shortfalls. Observational data link clusters to documented hesitancy rather than vaccine failure. Next steps require targeted coverage restoration above 95% in high-risk counties within 12 months to prevent endemic re-establishment.
CDC surveillance data through late 2025 show 1,274 confirmed cases, exceeding the 2019 peak of 1,282 when adjusted for reporting delays, with 92% of patients unvaccinated or having unknown status. Incidence concentrated in 12 states with MMR coverage below 90% in school-aged cohorts, consistent with prior outbreaks where importation from endemic regions triggered sustained transmission. Historical patterns from 1989-1991 and 2019 demonstrate that once coverage falls below 92-95%, R0 of 12-18 enables rapid spread even from single imported cases.
Sources (2)
- [1]CDC Measles Surveillance Report 2025(https://www.cdc.gov/measles/data)
- [2]JAMA Pediatrics: MMR Coverage and Outbreak Risk 2019-2024(https://jamanetwork.com/journals/jamapediatrics)