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. 2022 Aug 17;106(18):6225–6238. doi: 10.1007/s00253-022-12113-8

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© The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2022, Springer Nature or its licensor holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.

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Fig. 2 — Evaluation of the IgG antibody titers (index titer value, ITV) against recombinant S and N proteins and peptides using “CoroSuchak.” Serum samples from various groups of subjects were collected and analyzed for the presence of SARS-CoV-2 IgG antibodies. An ITV value of 10 was used as a cut-off value, i.e., ITV below 10 was considered as no immune response, between 10 and 20 was considered as a low immune response, between 20 and 40 was considered a moderate immune response, and ITV > 40 as a high immune response. The error bars represent standard deviation (mean ± S.D.)