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. 2023 Feb 16;12(2):687–700. doi: 10.1007/s40120-023-00448-x

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© The Author(s) 2023

Open AccessThis article is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License, which permits any non-commercial 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-nc/4.0/.

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Fig. 2 — Anti-RBD IgG levels at a 8 weeks post initial vaccine dose and b 8, 24, and 36 weeks post initial vaccine dose. Anti-RBD IgG were quantified by Siemens Healthineers’ SARS-CoV-2 IgG (sCOVg) assay at a 8 weeks and b 8, 24, and 36 weeks post initial vaccine dose. The dotted line indicates the threshold of detection. Anti-RBD IgG SARS-CoV-2 spike receptor binding domain, GMT geometric mean titer