Fig. 5.

Linear regression of the interval from diagnosis of SARS-CoV-2 infection in CCP donors to plasmapheresis procedures and IgA antibodies (a) and IgG antibodies (b) measured by an ELISA. The lines show the linear regression and the dotted lines the 95% confidence limits. c PRNT50 titer grouped by anti-SARS-CoV-2 IgG and IgA ratios in the Euroimmune ELISA. The first column presents the PRNT50 titer of CCP which were in the lower quartile for both IgG and IgA. The second and third columns represent the titers of CCP which were in the lower quartile for either IgG or IgA and the fourth column for CCP with neither IgG nor IgA ratio in the lower quartile of the Euroimmune ELISA. The horizontal lines and error bars in (c) indicate mean titers ± 95% CIs.