COVID-19 Research Paper Volume 12, Issue 8 pp 6536—6542
Anti-SARS-CoV-2 virus antibody levels in convalescent plasma of six donors who have recovered from COVID-19
Figure 1. Specific immunoglobulin IgG were titrated by semiquantitative ELISA. Plasma IgG antibody titers ranged from 1:40 to >320.