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. 2021 Apr 16;11:8380. doi: 10.1038/s41598-021-87688-9

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© The Author(s) 2021, corrected publication 2021

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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Comparison of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) antibody levels among symptomatic and asymptomatic healthcare workers with antibodies against SARS-CoV-2. Antibody levels were quantified using the anti-SARS-CoV-2 antibody index (cutoff index, COI) in participants who had a positive result in the Elecsys Anti-SARS-CoV-2 electrochemiluminescence immunoassay. A COI of ≥ 1.0 was considered positive. Median values of the COI with lower quartile and upper quartile are shown according to symptom status. The difference in the median antibody level between the symptomatic and asymptomatic groups was not significant.