That's the trouble with MRSA, a kid just thinks it's a sore and then it develops into sepsis.
A friend of mine has a son who contracted MRSA last year while he was in college (he was part of a wrestling program at a college in PA.) Luckily the coach recognized the sore on the kids leg as something that should be checked out and it was caught early and cleared up with IV antibiotics.
I have a nephew in the hospital now with staph. Sore on his hand from lifting weights. IV antibiotics going in for the third day. Serious stuff.
Is MRSA one of those things that we have lost the ability to fight with our immune systems because we are too clean? Or is this one that has always been a nasty bug?
I have noticed that the less a kid plays in the dirt growing up the less able they are to fight off some illnesses. That could only be a perception though.