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. 2021 Jul 7;11(7):e053036. doi: 10.1136/bmjopen-2021-053036

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© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution 4.0 Unported (CC BY 4.0) license, which permits others to copy, redistribute, remix, transform and build upon this work for any purpose, provided the original work is properly cited, a link to the licence is given, and indication of whether changes were made. See: https://creativecommons.org/licenses/by/4.0/.

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Longitudinal follow-up of SARS-CoV-2 antibody levels in infants. (A) The longitudinal IgG levels of the infants who had cord blood IgG level >50 relative fluorescent unit (RFU). The infants’ IgG levels in RFU is shown in y-axis, and the age of the infant in weeks at the time of follow-up is shown in x-axis. The infants whose IgG became negative, <50 RFU, during the longitudinal follow-up are shown in red colour. (B) The IgG and IgM levels of the term infant whose cord antibody was negative and seroconverted at 2 weeks of life. (C) The IgG and IgM levels of the 31 weeks’ preterm infant with confirmed intrapartum SARS-CoV-2 infection whose cord antibody was negative and seroconverted at 2 weeks of life.