Joined an infection game yesterday (the super speed where its extremely fast and you jump when you go off stuff, chopper gunner bullets, double thumper). So I left the infection game after I while. Today I turned my xbox back on and joined search and found that the mod was still on (I had host I assume). Went back in private match and found the infection was still there.

I thought infections left after you exited mw2?

Also, if its any help only the super speed is still on, the chopper gunner bullets is gone.