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. 2024 Oct 7;24:1116. doi: 10.1186/s12879-024-09999-2

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© The Author(s) 2024

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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Fig. 5 — Levels of RBD-specific IgG and IgA antibodies in plasma over a one-year follow-up period. IgG levels are represented on the left y-axis, and IgA levels on the right y-axis. (A) and (B) show antibody levels to the RBD of Delta and Omicron variants, respectively, in all samples. (C) and (D) show antibody levels in Delta-infected samples from Hospital A. (E) and (F) show antibody levels in Omicron-infected samples from Hospitals A, B, and C. The Mann-Whitney U test was used to compare the medians of non-normally distributed data. *, p ≤ 0.05; **, p ≤ 0.01; ***, p ≤ 0.001; and ****, p ≤ 0.0001 indicate statistical significance