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. 2021 Feb 11;12:641460. doi: 10.3389/fmicb.2021.641460

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Copyright © 2021 Breiman, Ruvoën-Clouet, Deleers, Beauvais, Jouand, Rocher, Bovin, Labarrière, El Kenz and Le Pendu.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Relationships between the anti-Tn and anti-αGal levels, ABO phenotypes and the levels of anti-S protein. Anti-S protein antibodies of COVID-19 patients were detected and quantified by the S-Flow assay at a plasma dilution of 1: 300. Data are shown as percentage of positive cells. Only positive plasma samples were considered. (A) Correlation between anti-S and anti-Tn, Spearman r p value is shown; (B) correlation between anti-S and anti-αGal, Spearman r P-value is shown; (C) relationship between ABO phenotypes and anti-S. Only anti-S positive individuals (with cut-off values >30%) were considered. P-values from Mann-Whitney comparisons are indicated: *p < 0.05, ***p < 0.001.