ACTA1 and cervical carcinoma: Our lab has obtained two cervical cancer vaccine candidate strains, LM∆E6E7 and LI∆E6E7, constructed utilizing attenuated LM (LM∆), which knocked out the virulence genes actA and plcB, and attenuated Listeria ivanovii (LI∆), which knocked out the virulence genes actA and plcB, as vectors [10, 11].