My 2 and a half year old keeps getting strep throat...?

My 2 1/2 year old has had strep throat 6 times since the beginning of the year. 1 of those times it was scarlet fever and they treated the rash, but the antibiotic did not get the strep so he ended up having it for a month. Anyway, we go to the doctor - they give him his meds - we go back to make sure it is gone. The doctor we seen this week says there are kids who are now just "carriers" of it and always test positive. I asked about getting his adnoids or tonsils out and she said they do not recommend doing that until they are around 4 because it is too risky at that age. Does anyone know if getting those out will help at all? I know there is still a chance for him to get strep, but will it lower the chance??