Figure EV5. Plaque reduction assay.

SARS‐CoV‐2 (4000 plaque‐forming units, PFUs) was incubated with antibodies at the indicated amounts for 1 h at 37°C before adding to the Vero E6 cell monolayer for another hour. After the mixtures were removed, the cells were washed and replaced with overlay medium for 5 days. Plaque formation was determined by crystal violet staining. NTU01: SARA‐CoV‐2 that was isolated from a female patient suffering from COVID‐19 infection at National Taiwan University Hospital.