Originally posted by another user
Some guy known as "Hunter" created this h*ck, he invited friends to his lobby in a private match and then they too, had the super speed. If they hosted a lobby their friends would also get it, hence the nickname "Infection", its spreading and spreading throughout CoD players. However if you restart your PS3 you lose the super speed. However "Hunter" has it permanantly due to being the creator.
FAILBLOG, infection gets lost after you quit game, and after you have been infected, only works in private match apart form hunters