Original Investigation

Coadministered Influenza- and Pertussis-Containing Vaccines in Pregnant Women

JAMA Network Open 10.1001/jamanetworkopen.2026.7551

April 17, 2026 at 11:00 AM EDT

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Is concomitant (ie, same day) influenza and pertussis vaccination during pregnancy associated with adverse pregnancy, birth, and neonatal outcomes?This cohort study of 13 918 singleton pregnancies found concomitant administration of influenza- and pertussis-containing vaccines was not associated with an increased rate of preterm birth, small for gestational age, or low birth weight among pregnant women compared with matched women who received the pertussis vaccine alone.These findings provide evidence-based support for clinicians in recommending vaccination concomitantly during pregnancy.

Corresponding Author: Nicole Sonneveld, MSc(Med), National Centre for Immunisation Research and Surveillance, Kids Research, Sydney Children’s Hospitals Network, Cnr Hawkesbury Rd nicole.sonneveld@health.nsw.gov.au).

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