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if you are banned from the mw3 leaderboards all you have to do is reset your stats and you will no longer be banned from the leaderboards.
depends on the infect. if you host the infect XP mybe, it all depends on how high you get in the leaderboards. if you get in top 1000 u have a good chance of getting banned, if you stay below 1100 you prolly wont get nothing done to you.