
Keywords: ویروس واکسیناسیون نوترکیب; Respiratory syncytial virus; Calves; Respiratory disease; Vaccines; Immunity; Pathogenesis; BRSV; bovine respiratory syncytial virus; HRSV; human RSV; BAL; bronchoalveolar lavage; rVV; recombinant vaccinia virus; rBHV-1; recombinant bovine herpesvirus -1;