RIGI and infection: To determine whether pigeon CARDs and RIG-I induce an antiviral response against IBDV or influenza virus in chicken cells, DF-1 cells were transfected with ppCARDs-EGFP, ppRIG-I-EGFP, or pEGFP-N1, followed by infection with ZB07, IBDV TS/CJ801 or mock-treated.