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. 2022 Jan 31;13:827306. doi: 10.3389/fimmu.2022.827306

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Copyright © 2022 Choi, Kim, Heo, Oh, Kim, Lee and Yoo

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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Neutralizing antibody (A) and IgG antibodies against the spike receptor-binding domain of SARS-CoV-2 (B). This is an antibody titer analyzed at visit 2 (4 weeks after 1^st vaccination), visit 3 (3 months after 2^nd vaccination), and visit 4 (6 months after 2^nd vaccination). Diamond marks were represented as mean values.