I had GBS at the age of 10 months from a DTP vaccination. In most of my cases Dr’s would not give me any further vaccines. They have discouraged me from gettting anything like that. When I went to college I had waivers for many of my vaccinations. I lived a perfectly healthy life in a college dorm. My policy has been the less the better. I think in his case this may also be true!
Best of Luck!:)