Figure 6.

The observation of cytopathic effects (CPEs) in the neutralization test. The recombinant scFv was incubated with 400 TCID₅₀/mL PEDV-PT-passage 5 for 2 h and subjected to the Vero cells. The CPE was observed every 24 h and the images were taken at the end time point, 72 h. (A) The group was supplemented with 25 μg/mL scFv and virus. (B) The challenge control group (virus without the scFv). (C) The non-challenged control group (no virus, no scFv). The black bars represented 100 μm in length.