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. 2023 Jun 5;23:374. doi: 10.1186/s12879-023-08332-7

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© This is a U.S. Government work and not under copyright protection in the US; foreign copyright protection may apply 2023

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/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 5 — Paired sera results for students who participated during the investigation’s September and December time points — fall academic semester 2021, Wisconsin. Top panel displays the levels of antibody targeting the spike protein of SARS-CoV-2 (anti-S) and the bottom panel displays the levels of antibody targeting the nucleocapsid protein (anti-N), both in WHO-standardized binding antibody units per milliliter (BAU/mL), log (10) scale. Month of blood draw is presented on the x-axis. Sera values are categorized based on previous history of COVID-19 illness (shape) and vaccination status (color) at blood draw. Horizontal dashed lines indicate the assay threshold of positivity