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. 2021 Apr 13;11:8021. doi: 10.1038/s41598-021-87535-x

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Dynamic changes of serum antibodies to SARS-CoV-2 in 4 COVID-19 mothers and their 4 infants. Antibody concentration ≥ 1.0 s/Co was defined as positive. Solid lines mean levels of IgG, dotted lines mean levels of IgM. M cases of mothers, Inf cases of infants. (a) antibodies levels of mothers; the serum antibodies detection interval of mother 1 was on the day of 27 and 91, mother 2 on the day of 16 and 71, mother 3 on the day of 17 and 64, and mother 4 on the day of 26 and 73 after onset. (b) antibodies levels of infants; the serum antibodies detection interval of four infants was on the day at birth and the day of 63, 63, 46 and 31 after birth, the same day with their mothers respectively. All 4 infants were formula fed.