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. 2021 Mar 11;12:637982. doi: 10.3389/fimmu.2021.637982

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Copyright © 2021 Srivastava, Niu, Phadke, Bellaire and Cho.

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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Avidity of antibodies against the RBD. ELISA was done in the presence of (A) 1M, (B) 2M or (C) 3M NaSCN and compared to without to determine relative avidity index. Serum samples collected 2 weeks after the second and 2, 12, or 20 weeks after the third immunizations were evaluated at 1:1,800 dilution.