Adeno Virus in Bearded dragons?

the only way to know for sure is to do a necropsy (animal autopsy). They don't know how it is spread so it is best to house him alone. This could be why he has all these other things wrong with him. Pretty much he could go through life being healthy then sick keep his environment it tip top shape a good balanced diet , and low stress should help. how long they live with this can be years to days older dragons tend to do better than the younger. regular trips to the vet can be excepted for all the secondary infections and parasites. You may at some point have to force feed him and water him as well.