The Binding Activity of SARS-CoV-2-S Antibody, HRP conjugated with SARS-CoV-2-S. Activity: Measured by its binding ability in a functional ELISA. Immobilized SARS-CoV-2-S (CSB-MP3324GMY) at 2 μg/ml can bind SARS-CoV-2-S Antibody, HRP conjugated, the EC<sub>50</sub> is 298.5 to 368.1 ng/ml.