Jack probably had to leave. My son had an MRSA in his face at age three, and they put him in isolation in the emergency room, and then in the pediatric unit for a week. And his cousin (just a few months younger) ended up in the same unit the next day, but they couldn't see each other (And my SIL couldn't come to see us) due to Andrew's infection.
It's so dangerous because the blood flows from the face to the brain. At least that's what the doctor told me.