Tardy Primary Vaccines Predict the Kids Most Likely to Miss Their MMR Shots

MedPage Today January 2, 2026
Terrence Rudd

Delayed primary series at 2 and 4 months portend missed MMR vaccination

Key Takeaways

• Infants who were late to receive their age-2-month doses of routine vaccines were more likely to not have an MMR shot by age 2 years, health records showed.
• Overall, on-time MMR vaccination rates slid after the COVID-19 pandemic.
• The U.S. faces its worst resurgence of measles in more than three decades and could lose its measles elimination status soon.

Children who received their 2- and 4-month-old doses of routine childhood vaccines late were most likely to have received no measles, mumps, and rubella (MMR) vaccination by age 2 years, according to a large U.S. cohort study.

In the post-COVID-19 pandemic period, infants who were...

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