Between or among different strains of phage ε 15 which were obtained from S. newington, S. selandia, S. newbrunswick, S. cambridge and S. kinshasa of group E2, and S. canoga, S. illinois and S. thomasville of group E3 no difference was noticed in their host range, heat resistance, resistance to ultraviolet light, effect of pH and effect of citrate.
