Figure 4. Depletion assay with P196-215 and P204-223 of
SARS-CoV-2 RBD protein. (A) Specific reactivity of 10 COVID-19
patients’ sera antibodies to P196-215 and P204-223 peptide of RBD
protein was assessed by evaluating the reactivity of P196-215 and
P204-223 adsorbed and non-adsorbed sera against native RBD by ELISA.(B) Two representative serum samples were also tested by
Western blot. The solid lines represent mean values ± SD. RBD: Receptor
binding domain.