Oncolytic viruses are a class of antitumor agents that selectively kill tumor cells without affecting normal cells. Vaccinia virus (VACV) is a large, enveloped virus that is considered as the most potential live biotherapeutic agent because of its strong oncolytic efficacy and potent antigen presentation capability that can combine well with its natural oncolytic activities for cancer immunotherapy. Many types of modified vaccinia virus have been used for in vitro and in vivo studies, as well as clinical trials.https://www.creative-biolabs.com/oncolytic-virus/category-pre-made-oncolytic-vaccinia-virus-291.htm