BNT162b2 mRNA vaccine elicited antibody response in blood and milk of breastfeeding women

Michal Rosenberg-Friedman, Aya Kigel, Yael Bahar, Michal Werbner, Joel Alter, Yariv Yogev, Yael Dror, Ronit Lubetzky, Moshe Dessau, Meital Gal-Tanamy, Ariel Many and Yariv Wine ()
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Michal Rosenberg-Friedman: Lis Maternity & Women’s Hospital, Tel Aviv Sourasky Medical Center
Aya Kigel: Tel Aviv University
Yael Bahar: Tel Aviv University
Michal Werbner: Bar-Ilan University
Joel Alter: Bar-Ilan University
Yariv Yogev: Lis Maternity & Women’s Hospital, Tel Aviv Sourasky Medical Center
Yael Dror: Tel Aviv University
Ronit Lubetzky: Tel Aviv University
Moshe Dessau: Bar-Ilan University
Meital Gal-Tanamy: Bar-Ilan University
Ariel Many: Lis Maternity & Women’s Hospital, Tel Aviv Sourasky Medical Center
Yariv Wine: Tel Aviv University

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract The importance of breastmilk in postnatal life lies in the strong association between breastfeeding and the reduction in the risk of infection and infection-related infant mortality. However, data regarding the induction and dynamics of breastmilk antibodies following administration of the Pfizer-BioNTech BNT162b2 COVID-19 mRNA vaccine is scarce, as pregnant and lactating women were not included in the initial vaccine clinical trials. Here, we investigate the dynamics of the vaccine-specific antibody response in breastmilk and serum in a prospective cohort of ten lactating women who received two doses of the mRNA vaccine. We show that the antibody response is rapid and highly synchronized between breastmilk and serum, reaching stabilization 14 days after the second dose. The response in breastmilk includes both IgG and IgA with neutralization capacity.

Date: 2021
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DOI: 10.1038/s41467-021-26507-1

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