Infants of vaccinated mothers less likely to test positive for COVID-19

Article

COVID-19 vaccination during pregnancy may reduce infants’ risk of infection during the early months of life, according to a recent study.

Infants of mothers vaccinated during pregnancy had a lower risk of positive COVID-19 infection in the first 4 months of life than infants of unvaccinated mothers, according to findings in JAMA Internal Medicine.1

The population-based cohort study, based in Norway, included 21,643 live births between September 1, 2021, and February 28, 2022. Nearly half of them (45%, n=9,739) were born to women who received a second or third dose of a COVID-19 during the last 2 trimesters of pregnancy.

Infants of those vaccinated during pregnancy were less likely to test positive for COVID-19 than infants of unvaccinated women, and less likely to test positive during the Delta surge (incidence rate, 1.2 vs 3.0 per 10,000 follow-up days; adjusted hazard ratio, 0.29; 95%CI, 0.19-0.46) than the Omicron surge (incidence rate, 7.0 vs 10.9 per 10,000 follow-up days; adjusted hazard ratio, 0.67; 95%CI, 0.57-0.79).

The study also showed a lower risk of infection among infants born to women who received a third dose of the vaccine than those who only received a second, suggesting a stronger level of protection after a booster dose.

Maternally transferred antibodies are critical in protecting a newborn infant from infection. While recent studies have shown that vaccinated women transfer COVID-19 antibodies in-utero and while breastfeeding, these study results provide further evidence to support the recommendation that pregnant women should receive the COVID-19 vaccine.

Reference

Carlsen EØ, Magnus MC, Oakley L, et al. Association of COVID-19 Vaccination During Pregnancy With Incidence of SARS-CoV-2 Infection in Infants. JAMA Internal Medicine. Published online June 1, 2022. doi:10.1001/jamainternmed.2022.2442

Newsletter

Get the latest clinical updates, case studies, and expert commentary in obstetric and gynecologic care. Sign up now to stay informed.

Recent Videos
Jihong Liu, ScD, explains how to improve perinatal outcomes in COVID patients | Image Credit: sc.edu.
Jihong Liu, ScD, highlights adverse perinatal outcomes linked to the COVID pandemic | Image Credit: sc.edu.
COVID-19 Therapy Roundtable: Focusing on inpatient care
COVID-19 Therapy Roundtable: Defining the virus today and treatment options
The importance of maternal vaccination | Image Credit: nfid.org.
Jeanette Carpenter, MD
Related Content
© 2025 MJH Life Sciences

All rights reserved.