I'm so sorry you and your son went through this!!!
I would honestly not rehome the reptiles though. There are risks with any pet, going outside to play, going to school or the supermarket. Unless your child is found to have some severely compromised immune system (leukemia, organ transplant recipient, congenital immune suppression), this is not necessary.
If you practice good hand-washing and don't allow the children to hold the reptiles for now, you should be okay. As you can see in my sig, we have lots of pets and some of them do carry risks. We just wash our hands and keep things reasonably clean.
Also talk to the vet about possibly treating the animals in question. I have no idea if this is something they do or not, but it would be a good conversation to have.
P.S. While I cannot and will not give official medical advice, even as a registered nurse with 4 years Pediatric ICU experience, I can give you advice as a fellow parent and tell you what I would do in your situation.