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Maternal SARS-CoV-2 vaccination and infant protection against SARS-CoV-2 during the first six months of life
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Journal Article
Maternal SARS-CoV-2 vaccination and infant protection against SARS-CoV-2 during the first six months of life
2023
Overview
We examined the effectiveness of maternal vaccination against SARS-CoV-2 infection in 30,311 infants born at Kaiser Permanente Northern California from December 15, 2020, to May 31, 2022. Using Cox regression, the effectiveness of ≥2 doses of COVID-19 vaccine received during pregnancy was 84% (95% confidence interval [CI]: 66, 93), 62% (CI: 39, 77) and 56% (CI: 34,71) during months 0–2, 0–4 and 0- 6 of a child’s life, respectively, in the Delta variant period. In the Omicron variant period, the effectiveness of maternal vaccination in these three age intervals was 21% (CI: −21,48), 14% (CI: −9,32) and 13% (CI: −3,26), respectively. Over the entire study period, the incidence of hospitalization for COVID-19 was lower during the first 6 months of life among infants of vaccinated mothers compared with infants of unvaccinated mothers (21/100,000 person-years vs. 100/100,000 person-years). Maternal vaccination was protective, but protection was lower during Omicron than during Delta. Protection during both periods decreased as infants aged.
This study investigates the impact of maternal COVID-19 vaccination during pregnancy on infant infection during the first six months of life. Using data from California, USA, the authors find that protection against infection during the period of Delta dominance was high, but that it declined during the Omicron period.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
/ Child
/ COVID-19
/ COVID-19 - prevention & control
/ Female
/ Humanities and Social Sciences
/ Humans
/ Infant
/ Infants
/ Mothers
/ Pregnancy Complications, Infectious - epidemiology
/ Pregnancy Complications, Infectious - prevention & control
/ Science
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