leads to an unprecedented medical burden and lives lost. Neutralizing antibodies provide
efficient blockade for viral infection and are a promising category of biological therapies.
Here, using SARS-CoV-2 spike receptor-binding domain (RBD) as a bait, we generate a
panel of humanized single domain antibodies (sdAbs) from a synthetic library. These sdAbs
reveal binding kinetics with the equilibrium dissociation constant (KD) of 0.99–35.5 nM. The …