11.5 Lysogeny is maintained by an autogenous circuit Immunity in phages refers to the ability of a prophage to prevent another phage of the same type from infecting a cell. It results from the synthesis of phage repressor by the prophage genome Virulent phage mutants are unable to establish lysogeny 消当Immunity in phages refers to the ability of a prophage to prevent another phage of the same type from infecting a cell. It results from the synthesis of phage repressor by the prophage genome. Virulent phage mutants are unable to establish lysogeny. 11.5 Lysogeny is maintained by an autogenous circuit