Alliance for Pandemic Preparedness

March 3, 2021

SARS-CoV-2 Antibodies Detected in Human Breast Milk Post-Vaccination

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  • [Pre-print, not peer-reviewed] Significantly elevated levels of SARS-CoV-2 specific IgG and IgA antibodies were observed in breast milk starting 7 days after the initial vaccine dose in a cohort study of six lactating women who had received both doses of either the Pfizer/BioNTech or Moderna vaccines. The authors note that the response following vaccination was IgG dominant, in contrast to natural infection in which other studies have found IgA predominates. 

Baird et al. (Mar 2, 2021). SARS-CoV-2 Antibodies Detected in Human Breast Milk Post-Vaccination. Pre-print downloaded Mar 3 from https://doi.org/10.1101/2021.02.23.21252328