Whatever you do keep him away from all sugar, it feeds infections like gasoline on a fire. Make sure he is eating good foods like a lot of veggies and lean proteins like skinless chicken or fish. Ask the doctors if he can be given a complete multi-vitamin from an organic food based source. Also a multi-mineral that includes zinc, it helps clip polypeptide linkages that holds viruses together. He will respond faster to the doctors treatment if he is getting the right foods and supplements. For what its worth.
God Bless and we will continue to pray for him and your family. Keep the Faith BK.