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. 2021 Feb 1;90:15–22. doi: 10.1016/j.clinbiochem.2021.01.010

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© 2021 The Canadian Society of Clinical Chemists. Published by Elsevier Inc. All rights reserved.

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Fig. 3 — Distribution of SARS-CoV-2 S1-RBD IgG titers among outpatients and healthcare workers. SARS-CoV-2 S1-RBD total antibody positive sera from outpatients (n = 106) and healthcare workers (n = 38) were analyzed by endpoint IgG titer using our laboratory-developed ELISA. The distributions of IgG titers in these populations were not significantly different (p = 0.60, Chi-square test).