ACE2 and infection: For this, we infected Vero E6 cells with 60 plaque-forming units (PFU; multiplicity of infection (MOI): 0.002) of SARS-CoV-2 in the presence of 10–50 μg/mL ACE2-wt-Fc, ACE2-T92Q-Fc, or ACE2-N322Q-Fc.