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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 natural anti-carbohydrate antibodies, ABO phenotypes and infection status. Analyzed carbohydrate antigens are indicated on each panel. Antibodies levels are shown as OD450 nm values at 1: 30 plasma dilutions. Infected patients are defined as SARS-CoV-2 +, regardless of their clinical status or subdivided as asymptomatic and symptomatic COVID-19 +. Controls presented no sign of disease, were RT-PCR negative and anti-S negative. Plots show median values and quartiles (horizontal bars). P-values from Mann-Whitney between-groups comparisons are indicated: *p < 0.05.