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. 2021 Feb 22;11(2):e047216. doi: 10.1136/bmjopen-2020-047216

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© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Number of IgG tests (left panel) and percentage of positive IgG tests (right panel) in 162 subjects with a positive nasopharyngeal swab (NPS) prior to serological testing, according to days elapsed since day of first positive NPS. Left panel shows histogram and kernel density smoothing line. In right panel circles indicate subjects with negative (lower circles, n=41) or positive (upper circles, n=121) anti-SARS-CoV-2 IgG, solid and dashed lines are the predicted percentages calculated with a logistic regression model, and dashed lines are 95% bands around the predicted.