Methods . Cells culture . The Vero C1008 cells (ATCC No. CRL-1586), the HEK293 cells (ATCC No. CRL-1573), and the Intestinal porcine epithelial cell line-J2 (IPEC-J2) cells (ACC701; Leibniz Institute DSMZ – German Collection of Microorganisms and Cell Cultures, Braunschweig, Germany) were cultured in the Dulbecco’s modified Eagle’s medium (DMEM, Gibco, NY, USA) supplemented with 10% fetal bovine serum (Gibco, Thermo Fisher Scientific, MA, USA) and antibiotic-antimycotic (Gibco, Thermo F...