Evidence map›Paper›PMID 34735722›Full record

SynthesisInternational journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics2022

Systematic review of the safety, immunogenicity, and effectiveness of COVID-19 vaccines in pregnant and lactating individuals and their infants.

Winnie Fu, Brintha Sivajohan, Elisabeth McClymont, Arianne Albert, Chelsea Elwood, Gina Ogilvie, Deborah Money

Open access · bronzeAbstract readSystematic Review
In one paragraph

Synthesis in International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 66 papers, 5 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
66citing papers in PubMed, 5 pooled it
15.7field-weighted citation impact, top 1% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

66 citing papers in PubMed, 5 syntheses or guidelines pooled it, 118 citations in OpenAlex.

  1. Pooled it
  2. Pooled it
  3. Pooled it
  4. Pooled it
  5. Systematic review of the safety, immunogenicity, and effectiveness of COVID-19 vaccines in pregnant and lactating individuals and their infants.International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics · 2022
    Pooled it
  6. Trial
  7. Gamma SARS-CoV-2 variant of concern infection repercussions on pregnancy outcomes: A translational cohort study.International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics · 2026
    Article
  8. Article
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  11. Childhood infectious diseases: experiences and challenges.World journal of pediatrics : WJP · 2025
    Article
  12. Review
  13. Article
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  15. Review
  16. Article
  17. Knowledge and attitudes of pregnant women about COVID-19 vaccination.Revista latino-americana de enfermagem · 2025
    Article
  18. Article
  19. Article
  20. Article

6 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

7 authors at 3 institutions in 1 country.

Winnie FuFaculty of Medicine, University of British Columbia, Vancouver, British Columbia, Canada.ORCID https://orcid.org/0000-0002-7741-9868
Brintha SivajohanSchulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada.
Elisabeth McClymontDepartment of Obstetrics and Gynecology, University of British Columbia, Vancouver, British Columbia, Canada.
Arianne AlbertWomen's Health Research Institute, Vancouver, British Columbia, Canada.
Chelsea ElwoodDepartment of Obstetrics and Gynecology, University of British Columbia, Vancouver, British Columbia, Canada.
Gina OgilvieWomen's Health Research Institute, Vancouver, British Columbia, Canada.
Deborah MoneyDepartment of Obstetrics and Gynecology, University of British Columbia, Vancouver, British Columbia, Canada.ORCID https://orcid.org/0000-0003-4411-7473
University of British Columbia · CAWestern University · CAWomen's Health Research Institute · CA

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundThere is significant risk of complications and vulnerability to severe COVID-19 disease in pregnancy, yet hesitancy exists around COVID-19 vaccination during pregnancy and lactation.

objectiveTo summarize the safety, immunogenicity, and effectiveness of COVID-19 vaccines in pregnancy and lactation. SEARCH STRATEGY: A systematic search of MEDLINE, Embase, PubMed, medRxiv, and bioRxiv. SELECTION CRITERIA: Identified original studies published on pregnant and/or lactating individuals who received one or more doses of a COVID-19 vaccine. DATA COLLECTION AND ANALYSIS: A descriptive summary organized by safety, immunogenicity, and effectiveness outcomes of COVID-19 vaccination in pregnancy and lactation. MAIN

resultsIn total, 23 studies were identified. Humoral response and functional immunity were interrogated and found. Increasing placental transfer ratios in cord blood were associated with increasing time from the first vaccine dose to delivery. Safety data indicated that pregnant and lactating populations experienced vaccine-related reactions at similar rates to the general population. No increased risk of adverse obstetrical or neonatal outcomes were reported. One study demonstrated that pregnant individuals were less likely to experience COVID-19 when vaccinated.

conclusionCOVID-19 vaccination in pregnant and lactating individuals is immunogenic, does not cause significant vaccine-related adverse events or obstetrical and neonatal outcomes, and is effective in preventing COVID-19 disease.

Indexed as

COVID-19COVID-19 VaccinesFemaleHumansInfantInfant, NewbornLactationPlacentaPregnancySARS-CoV-2VaccinationCOVID-19 VaccinesbreastfeedingCOVID-19COVID-19 vaccineslactationpregnancySARS-CoV-2

Identifiers

PMID34735722
PMCPMC9087489
OpenAlexW3208732652

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.