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Study finds no increased risk of birth defects after COVID-19 infection or vaccination in early pregnancy

July 18, 2024
in Health
Study finds no increased risk of birth defects after COVID-19 infection or vaccination in early pregnancy
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Credit: Unsplash/CC0 Public Domain

Neither COVID-19 infection nor vaccination during the first trimester of pregnancy is associated with increased risk of major birth defects, finds a study from Scandinavia published by The BMJ today.

It’s well-known that women who experience COVID-19 infection during pregnancy are at increased risk of severe illness and have a higher risk of complications, including preterm birth and stillbirth.

Less clear is the risk of birth defects (congenital anomalies) after infection with or vaccination against COVID-19, as it has only recently become possible to study this research question.

To explore this, researchers used national health registries to identify 343,066 liveborn single infants in Sweden, Denmark and Norway with an estimated start of pregnancy between 1 March 2020 and 14 February 2022 and a minimum of nine months of postnatal follow-up time.

Information on laboratory-confirmed polymerase chain reaction (PCR) positive COVID-19 tests and vaccination was obtained from national health records and vaccination registries.

Major congenital anomalies were grouped according to EUROCAT definitions and included defects of the heart, nervous and respiratory systems, eye, ear, face and neck anomalies, oro-facial clefts, genital and limb anomalies.

Potentially influential factors such as mother’s age, education, country of birth, weight (BMI), existing chronic conditions, and smoking during pregnancy, were also accounted for in the analyses.

Of the 343,066 infants included in the infection analysis, 10,229 (3%) were exposed to COVID-19 infection during the first trimester, and of 152,261 infants in the vaccination analysis, 29,135 (19%) were exposed to COVID-19 vaccination during the first trimester.

A total of 17,704 (5.2%) of infants were diagnosed with a major congenital anomaly, but the researchers found no increased risk of any major congenital anomaly after infection with or vaccination against COVID-19 during the first trimester.

Overall, no notable increased risk among offspring of women vaccinated against COVID-19 during the first trimester was found for ten of the eleven groups of anomalies evaluated.

This is an observational study, so no firm conclusions can be drawn about cause and effect, and although the researchers adjusted for a range of factors, they can’t rule out the possibility that other unmeasured factors, such as underlying genetic risk and pre-existing conditions in the women, may have influenced their results.

Nevertheless, this was a large study that used high-quality data from several countries, and results were similar after further analyses providing greater confidence in their conclusions.

As such, they say that neither COVID-19 infection or vaccination during the first trimester of pregnancy were associated with congenital anomalies. There also appeared to be no notable variation in the risk according to viral variants, although larger studies are needed to provide more robust evidence.

More information:
Covid-19 infection and vaccination during first trimester and risk of congenital anomalies: Nordic registry based study, The BMJ (2024). DOI: 10.1136/bmj-2024-079364

Citation:
Study finds no increased risk of birth defects after COVID-19 infection or vaccination in early pregnancy (2024, July 17)
retrieved 18 July 2024
from https://medicalxpress.com/news/2024-07-birth-defects-covid-infection-vaccination.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.

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Copyright for syndicated content belongs to the linked Source : Medical Xpress – https://medicalxpress.com/news/2024-07-birth-defects-covid-infection-vaccination.html

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