the M-virus resembles the bacteriophage in a almost uncanny way, its all grey and looks exactly like it, however instead of doing what a bacteriophage normally does this virus turns people into monsters such as werewolves, vampires, and etc, the virus is sentient and can talk to people when it infects them, the infection of this virus is spread by animals such as wolves and bats, it can be cured only by salt.