①Measured by its binding ability in a functional ELISA. Immobilized SARS-CoV S-RBD at 2 μg/ml can bind Paguma larvata ACE2 , the EC50 is 5.056-7.559 ng/ml.②Measured by its binding ability in a functional ELISA. Immobilized SARS-CoV S-RBD at 5 μg/ml can bind human ACE2 , the EC50 is 7.941-10.49 ng/ml.