I don't have an answer, I am lucky in the fact that I have not gotten sick since going vegan. (which really speaks loudly of how good being a vegan with a very clean diet can be, with exercise of course.).
The only medical treatment I've received since going vegan was a tetanus booster a while ago. While at work I was getting something in the clean utility room (with rusty shelving...) and I slipped and got a pretty savage wound on my hand. I think the tetanus boosters I got when i was a child were made with beef broth, but as far as i know, the current booster for DPT is vegan. I didn't really think to ask because I was in mild shock staring at the wound, and they just sort of gave it to me because they assumed I had only got my last booster a while ago (which they were correct, it had been twelve years).