SARS-CoV-2 IgG Antibody Levels in Women with IBD Vaccinated during Pregnancy

Irit Avni Biron*, Yair Maayan, Tali Mishael, Eran Hadar, Michal Neeman, Romina Plitman Mayo, Hen Y. Sela, Simcha Yagel, Rosalind Goldenberg, Ami Ben Ya’acov, Sorina Grisaru Granovsky, Jacob E. Ollech, Hadar Edelman-Klapper, Keren Masha Rabinowitz, Maor H. Pauker, Henit Yanai, Sophy Goren, Dani Cohen, Iris Dotan, Ariella Bar-Gil Shitrit

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Introduction: Regulatory agencies supported vaccination of pregnant women with SARS-CoV-2 mRNA vaccines, including patients with IBD. No data exist regarding these vaccines in IBD during pregnancy. Aim: To assess the serologic response to two doses of the mRNA SARS-CoV-2 BNT162b2 vaccine in pregnant women with IBD vaccinated during pregnancy, compared to that of pregnant women without IBD, and non-pregnant women with IBD. Methods: Anti-spike antibody levels were assessed in all women and in cord blood of consenting women. Results: From December 2020 to December 2021, 139 women were assessed: pregnant with IBD—36, pregnant without IBD—61, and not pregnant with IBD—42. Antibodies were assessed in cords of two and nine newborns of women with and without IBD, respectively. Mean gestational ages at administration of the second vaccine doses were 22.0 weeks in IBD and 23.2 weeks in non-IBD, respectively. Mean (SD) duration from the second vaccine dose to serology analysis in pregnant women with IBD, without IBD, and in non-pregnant women with IBD was 10.6 (4.9), 16.4 (6.3), and 4.3 (1.0) weeks, respectively. All women mounted a serologic response. In multivariable analysis, no correlation was found between the specific group and antibody levels. In both pregnancy groups, an inverse correlation between antibody levels and the interval from the second vaccine dose was demonstrated. Cord blood antibody levels exceeded maternal levels in women with and without IBD. Conclusion: All patients with IBD mounted a serologic response. The interval between vaccine administration to serology assessment was the most important factor determining antibody levels. A third vaccine dose should be considered in pregnant women with IBD vaccinated at early stages of pregnancy.

Original languageEnglish
Article number1833
Issue number11
StatePublished - Nov 2022


FundersFunder number
Israel Science Foundation KillCorona3777/19
Leona M. and Harry B. Helmsley Charitable Trust


    • COVID-19
    • inflammatory bowel disease
    • pregnancy


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