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. 2020 Aug 29;222(10):1629–1634. doi: 10.1093/infdis/jiaa531

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© The Author(s) 2020. Published by Oxford University Press for the Infectious Diseases Society of America. All rights reserved. For permissions, e-mail: journals.permissions@oup.com.

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Figure 3. — Titration of coronavirus disease 2019 (COVID-19)–positive/negative sera. Specimens were diluted at 2-fold dilutions from 1:50 to 1:6400 and tested using the Luminex assay described herein. Titration curves are shown for sera from 11 specimens from 8 infected patients using the mSpike as antigen (left) and for sera from 3 patients tested vs mRBD (right). Abbreviations: COVID-19, coronavirus disease 2019; MFI, mean fluorescence intensity; mRBD, mammalian-derived Receptor Binding Domain polypeptide; mSpike, mammalian-derived Spike protein.