IFNB1 and infection: The importance of IFNβ in determining the susceptibility to MG1 was further investigated by performing infections in the presence or absence of exogenous IFNβ; TC-32 and SK-N-MC cell lines were pre-treated with recombinant human IFNβ for 24 h before MG1 infection and tested for the effect of this IFN-I on viral replication and oncolysis.