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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
(A) IgG response against PRAK-03202 in COVID-19-negative and -positive convalescent samples. ---- indicates cut-off values. (B) ROC curve for the VLP-ELISA using optical density values.