[Name] M2448 virus (The Freak Virus) [Source] Crackdown 2 [Symptoms] 
The virus called M2448 was created by Catalina Thorne, the leader of Cell, during her time as a medical student working for the Agency. She conducted secret experiments of the virus but was discovered by the Agency and was kicked off the Agency-sponsored medical programme. She was enraged by this and wanted revenge on the Agency because it apparently ruined her life. To get her revenge she offered free vaccinations to the people of Unity Heights (formerly "The Corridor"), she was actually vaccinating her victims with the M2448 Virus which tuned them into Freaks. The virus spread across Unity Heights very quickly and soon made its way into the two other boroughs of Pacific City.