My daughter cultured MRSA once when she was 13 years old. She was able to clear it with a combination of two oral antibiotics but I don't remember what they were. She is now 20 years old and hasn't cultured it since.
I know this isn't typically how it goes for most people, but just wanted to let you know that it does happen from time to time. She has also cultured pseudomonus only once when she was 15, again.... so far so good for not having either one again yet!