Toddler 2 1/2 possible MRSA

My son had to get an abscess cut open and drained. It’s been such a horrible time for him and me because I feel so shitty. I’ve been looking up MRSA and it’s so bad. His test results aren’t back yet but he’s on antibiotics but what made me feel 1000% worse was that the doctor and nurse who were attending to him were like “we have never seen this on a kid his age” so now I feel like wtf did I do wrong, I’m a bit of a clean freak so my mind is just in such a horrible place right now trying to figure out what happened.