For rapid and accurate screening of recombinant modified vaccinia virus Ankara(rMVA)that satisfied the quality standards of clinical trials,a novel shuttle vector that can delete the marker gene automatically during virus propagation was constructed:pZL-EGFP.To construct the pZL-EGFP,the original shuttle vector pSC11 was modified by replacing the LacZ marker gene with enhanced green fluorescent protein(EGFP)and then inserting homologous sequences of TKL into the flank regions of EGFP.Baby hamster kidney(BHK...