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. 2021 Nov 11;1:46. doi: 10.1038/s43856-021-00045-9

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — Evaluation of NAb status from COVID-19 convalescent samples at different time points post infection from different follow up visits (FV) using (a, b) pVNT and (d, e) sVNT. Data shown in (a, d) were mean ± standard deviation (SD) of % neutralization for pVNT and mean ± SD% inhibition for sVNT, respectively. Each data points were performed in triplicates. Lines connecting different data points represented samples that were obtained from the same subjected collected at different time points. Data shown in (b, e) were mean values of % neutralization for pVNT and % inhibition for sVNT from different samples. c Correlation between sVNT and pVNT. Mean values from each data point were represented on the graph. f Alternative correlation plot between sVNT and pVNT where data were arranged from highest to lowest values of pVNT neutralization percentages. Data were represented as mean ± SD. Red and black dotted lines represent cut-off values at 50% and 20% for pVNT and sVNT, respectively, to distinguish positive and negative NAb status.