The IC50 values of five mAbs against the spike protein of SARS-CoV-2 Wuhan-1 (WA1-S), Alpha variant (Alpha-S), Beta variant (Beta-S), Gamma variant (Gamma-S), Delta variant (Delta-S), Kappa variant (Kappa-S), and Lambda variant (Lambda-S) are summarized in Fig. 1B. Although the IC50 of mAb-S5 against Delta-S (5.45 μg/mL) was higher than WA1-S (0.52 μg/mL), the blocking ability may still be able to protect against Delta variant infection. Here, RPS5 is linked to infection.