Fig. 3

Neutralizing activity of the mAbs against PDCoV infection. (A) PDCoV incubated with diluted 1C2 or 5H5 was used to infect LLC-PK1 cells. Neutralization was evaluated by IFA, using negative mouse serum as a control. Magnification, × 100. (B) The fluorescence in Fig. 3A was quantified. The neutralizing activity was calculated as: (1-—average fluorescence of dilution/average fluorescence of negative serum) × 100%