Corynebacteriophage
A corynebacteriophage (or just corynephage) is a DNA-containing bacteriophage specific for bacteria of genus Corynebacterium as its host. Corynebacterium diphtheriae virus strain Corynebacterium diphtheriae phage (aka Corynephage β or just β-phage) introduces toxigenicity into strains of Corynebacterium diphtheriae as it encodes diphtheria toxin, it has subtypes beta c and beta vir.