K.N.
A.,
I have recently been reading a lot about MRSA in the newspaper, as it seems high school athletes are getting it in locker rooms. I also did clinicals in a hospital setting where patients would have MRSA.
Make sure your BF keeps the wound covered with a bandage at all times and that he washes his hands frequently and always before playing with your son. They do have antibiotics that treat it, MRSA becomes a real problem when in RARE instances it gets into the blood stream and travels to organs. Just watch your son and if he displays sickness that does not get better take him to the ER and mention that he could have been exposed to MRSA.
I understand your concern--this has been on my mind lately also.
Good Luck,
K.
EDIT+++++
I just read the other responses about the solution that kills MRSA---I have a feeling that is how we got this resistant strain in the first place--over use of antibiotic drugs and topical killers. MRSA commonly lives in our nose and on our skin but only becomes a problem for some people, if we start to disinfect every surface with a MRSA killer the bacteria will continue to mutate and eventually become resistant making it even harder to help people who become infected with it. Basic hand washing/hygiene as well as a healthy immune system might be a smarter solution. Just my opinion!
K.