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. 2022 Jan 11;12:783975. doi: 10.3389/fimmu.2021.783975

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Copyright © 2022 Yeo, Chia, Tan, Ong, Yeo, Zhang, Poh, Lim, Sim, Sutamam, Chua, Albani, Wang and Chua

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The BNT162b2 mRNA amount detected in maternal serum and breastmilk across the different timepoints. Amount of BNT162b2 mRNA (ng/100ml) in (A) serum and (B) breastmilk across the different sampling timepoints. Only positive samples are plotted and specific shapes in the plots denote samples from individual mothers across both sample types types (median and 25^th/75^th quartiles plotted). Intact vaccine mRNA was detected in 20/74 serum samples tested from 21 mothers and 5/309 breastmilk samples tested from 31 mothers. Only 1 mother had detectable vaccine mRNA in serum and breastmilk samples (denoted by black filled square).