The Red

The Red is a super-rabies virus created by the Sacre Ordo. Once infected a person's mind is powerfully affected and they seem only capable of seeking out other uninfected humans to attack.
The Red was designed to be a perfect biological weapon, it does not infect any known species except humans (not even chimpanzees) and is resistant to popular medical treatments. Humans infected are no longer capable of complex behavior or reasoning, they are essentially rabid animals. They do not seek to feed or cloth themselves, causing them to burnout and die within a few short days of being infected.
Curiously, the virus seems designed not to affect Creator Adepts? 
Referenced:
-https://www.youtube.com/watch?v=c7ynwAgQlDQ