A.S.
My son had a bad staph infection in his knee when he was little . . . none of us ever got it. The way I understood it at the time is that staph is everywhere; it's just that sometimes a person's immune system can't fight it off, or it gets in a sore (my son had open sores on his knees from gluten intolerance) and takes hold.
I would call my doctor just to be on the safe side.
Staph is not something to mess with . . . but I would be cautiously optimistic.