About The Study: This county-level dataset complements the state and national-level Centers for Disease Control and Prevention data, confirming a widespread decline in measles-mumps-rubella (MMR) vaccination rates in the U.S. after the COVID-19 pandemic while revealing significant heterogeneity in vaccination patterns within and across states. This dataset can be used in spatial and statistical analyses to identify factors associated with low or declining MMR rates in U.S. counties and help inform targeted vaccination strategies to reduce the risk of measles outbreaks.
Corresponding Author: To contact the corresponding author, Lauren M. Gardner, PhD, email l.gardner@jhu.edu .
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(doi:10.1001/jama.2025.8952)
Editor’s Note: Please see the article for additional information, including other authors, author contributions and affiliations, conflict of interest and financial disclosures, and funding and support.
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