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Relative levels of absorbance of IgG (1A) and IgA (1B) against SARS-CoV-2, separated on the three study groups were compared from day 0 and day 28. Group 1 represent patients with mild disease, group 2 include patients with moderate disease and group 3 encompass patients with severe COVID-19. White circle indicates group 1, grey hexagon indicates group 2 whereas black triangle defines group 3.
