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. 2024 Jan;44(1):28-34.
doi: 10.1038/s41372-023-01843-w. Epub 2023 Dec 13.

SARS-CoV-2 neutralizing antibody titers in maternal blood, umbilical cord blood, and breast milk

Mazen Khalifeh  1 , Lorry G Rubin  2 , David Dayya  3 , Jane Cerise  4 , Karen Skinner  1 , Mona Maloney  1 , Charles Walworth  5 , Christos J Petropoulos  5 , Terri Wrin  5 , Kelly Chun  6 , Barry Weinberger  7
Affiliations

SARS-CoV-2 neutralizing antibody titers in maternal blood, umbilical cord blood, and breast milk

Mazen Khalifeh et al. J Perinatol. 2024 Jan.

Abstract

Objective: We quantified neutralizing SARS-CoV-2 antibody against spike protein (nAb) levels after vaccination and SARS-CoV-2 infection in maternal serum, cord blood, and breast milk and determined whether they correlate with levels of spike protein binding antibody.

Study design: Women (n = 100) were enrolled on admission for delivery. Previous SARS-CoV-2 infection was defined by anti-nucleocapsid antibodies. Levels of nAb and binding antibodies against spike receptor binding domain were measured in maternal blood, cord blood, and milk.

Results: Maternal nAb levels were higher after vaccine and infection than vaccine alone but waned rapidly. Levels of nAb in cord blood and milk correlated with maternal levels and were higher in cord blood than maternal. Spike protein binding antibody levels correlated with nAb.

Conclusion: SARS-CoV-2 vaccination near delivery may boost antibody-mediated immunity in the peripartum period. Neutralizing antibodies are passed transplacentally and into milk. Spike protein binding antibody may be a feasible proxy for nAb.

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