Magister Mundi

Looking at the author's credentials, I suspect that comes from holding anti-vaccination sentiments. It's pretty common in chiropractic practice, unfortunately, and the ridiculousness of the "anti-vaxx" movement aside, it's disappointing that the word itself appears to be a significant hurdle to even considering the therapy. Anyway, in this case, it...

It actually is a vaccine. Specifically, a therapeutic vaccine. I'm not sure why the author is putting it in quotes; this isn't some sort of dubious distinction.