About The Study: In this study, 15% of King County, Washington children received measles, mumps, rubella, and varicella (MMRV) as their first measles-containing vaccine and varicella-containing vaccine dose, a proportion that remained stable over time. Compared with other children in this analysis, more children who received MMRV were from minoritized racial and ethnic groups; received a catch-up dose; were Vaccines for Children-eligible; and were vaccinated at safety-net clinics. This population might be at risk of not receiving recommended vaccines if options become limited.
Corresponding Author: To contact the corresponding author, Eric J. Chow, MD, MS, MPH, email erchow@kingcounty.gov.
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(doi:10.1001/jamanetworkopen.2026.22734)
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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