Yes that can happen, although the amount of time can vary. It could be longer. But they donot disappear, they drop to normal.This also depends on which antibody we aree referring. It is the antbodies like IGM that indicate current active infections that are most likely to reduce to normal levels. The body makes the antibody to attack to infection. if the infection isnt there it doesnt make the antibody in the same amounts so has far as what happens to them, they are just not made.