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. 2022 Mar 15;18(5):2047582. doi: 10.1080/21645515.2022.2047582

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© 2022 The Author(s). Published with license by Taylor & Francis Group, LLC.

This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited, and is not altered, transformed, or built upon in any way.

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Figure 2. — OD values of the samples tested by IgG RBD ELISA; panel 2a: samples collected in 2018 in the Apulia region (2018 samples); panel 2b: human samples positive to other human CoVs (Other CoVs);panel 2c: samples from asymptomatic subjects (Asymptomatic); panel 2d: samples from COVID-19 convalescent patients (Convalescent); panel 2e: samples collected in 2019 in the Apulia region (2019 samples). Dots indicate individual serum samples, dashed lines indicate the OD value of the cutoff. For 2018 samples, arrow indicates consecutive numbering from sample 1 to sample 64.

* indicates samples positive to VN assay.