Thank you for sharing your story. I was diagnosed with left side UC, which after 7 years progressed to pancolitis. Since I have had the pancolitis, the only thing that has brought me true remission is antibiotics to include Cipro (can no longer tolerate due to rare side effect of tendonitis), Xifaxan and Clarithomycin. I have not used Vancomycin, but it is certainly something to consider and I will look at the supporting data you provided. Please keep us posted of your sons progress. I was in my late 30's when diagnosed and have always felt sorry for kids that develop this disease.
On the brighter side, the collective medical thinking about Chrons and UC has come light years since I was first diagnosed. At least big pharma is coming out with new meds to treat this stuff and the surgerical rate is declining. One good website to explore is IBDwatch.com. It is updated weekly and managed by a med student who has Chrons and is pursuing a career as a GI doc.
Current meds: just back on Clarithomycin, Coritfoam, Pentasa