The present disclosure provides compositions and methods for increasing the production of virus in vitro. Modified cells which are modified to eliminate or reduce as compared to a control cell the activity or expression of a Sterile a motif-domain containing protein 9 (SAMD9) polypeptide are provided. Methods of using these cells are also provided.

The present disclosure provides compositions and methods for increasing the production of virus in vitro. Modified cells which are modified to eliminate or reduce as compared to a control cell the activity or expression of a Sterile motif-domain containing protein 9 (SAMD9) polypeptide are provided. Methods of using these cells are also provided.

The present invention relates to a chimeric poxvirus with improved anticancer activity (higher cancer cell killing capacities and better tumor selectivity), as well as variant version thereof with one or more altered viral genes, recombinant versions thereof comprise one or more nucleic acid(s) of interest and recombinant variant versions thereof, all of which may be included in a composition and used for the treatment of a disease, in particular proliferative disease, notably cancers.