Four shots is a very very short period most vets have runs of one to two months of shots every three days. I am not sure there is a correlation between a disinfectant and an antibiotic but in any case I have never heard of vaporizing an antibiotic. I think I would seek a second opinion at this point. You vet is treating your snake more like a mammal than a reptile. A culture is a great idea however after antibiotics have been already given it is not accurate anymore and waiting for the antibiotics to clear the system (3 weeks+) is not likely a good idea.