Adaptation of rCH/SX/2016-S1HNXP+S3HNXP to Vero cells. (A) Schematic illustration of the construction of rCH/SX/2016-SHNXP, rCH/SX/2016-S1HNXP, rCH/SX/2016-S2HNXP, rCH/SX/2016-S1HNXP+S3HNXP, and rCH/SX/2016-S1HNXP+S4HNXP. S:1-1387aa, S1:1-729aa, S2:730-1387aa, S1HNXP+S3HNXP:1-976aa, S1HNXP+S4HNXP:1-729aa and 977-1387aa. (B) Vero cells were infected with rCH/SX/2016-SHNXP, rCH/SX/2016-S1HNXP, rCH/SX/2016-S2HNXP, rCH/SX/2016-S1HNXP+S3HNXP, and rCH/SX/2016-S1HNXP+S4HNXP. Cells were harvested at 24 and 48 hpi. Then RT-qPCR was performed to detect the relative expression of mRNA of PEDV N protein (C). Vero cells were infected with rCH/SX/2016-SHNXP and rCH/SX/2016-S1HNXP+S3HNXP. Infected cells were fixed at 36 h postinfection and immunolabeled with Fluorescein (FITC)-AffiniPure Goat Anti-Mouse IgG (H+L). Nuclei were labeled with DAPI (blue).