Overview
- Researchers analyzed Truveta electronic health records for more than 321,000 children in routine care from 2018 through April 2025 to assess timing of the first MMR dose.
- Delays in the recommended 2- and 4-month vaccines were the strongest predictors of receiving no MMR by age 2, flagging the earliest well visits as critical intervention points.
- On-time MMR coverage rose to 79.9% in 2021 then declined to 76.9% in 2024, as the share unvaccinated by age 2 increased from 5.3% in 2020 to 7.7% in 2024.
- Across the full period, 78.4% received MMR on time, 13.9% were delayed, and 6.7% had not received the vaccine by age 2.
- Boys, white non-Hispanic children, and those in rural areas had higher odds of no MMR despite regular care, and experts urge earlier engagement as CDC reports a recent measles surge surpassing 2,000 cases.