Figure 5.

SARS-CoV-2 antibody immunity in pre-COVID-19 era. Neutralisation capacities on the pseudotyped vectors of the IgG isolated from the serum of COVID19 Patient 5 drawn 17 days after symptom onset, diluted with standard diluant (orange) or with each of the three IVIG batches (IVIG-1 in green, IVIG-2 in purple and IVIG-3 in red) with a final IVIG IgG concentration of 12 mg/mL in the neutralisation assay. Half maximal inhibitory concentrations (IC₅₀) of patient’s serum alone (11.67 µg/mL) or diluted with IVIG batch 1 (9.94 µg/mL), IVIG2 (9.14 µg/mL) and IVIG3 (10.15 µmg/mL) are shown with dotted lines.