Terrible symbolism-based blood transfusions

Recently, I read a tumblr post about how it was believed that blood transfusions could cure psychosis - specifically, blood from a biblically "pure" animal, like a lamb or calf, would imbue the subject with their sweet and pure nature, thus tempering and subduing any "madness." On the occasions where this even actually worked, it was only because the psychosis in question being caused by a syphilis - which, sensitive to temperature changes, would die in the ensuing fever as the body rejected the incompatible transfused blood. For preservation purposes, I'm going to put the text of this post under a cut bellow.

( original post by macgyvermedical on tumblr, July 18/19 2022 )

Naturally, I wanted to double check that this post had any basis in anything and wasn't just lying for clout, and immediately found the following article:

350 Years Ago, A Doctor Performed the First Human Blood Transfusion. A Sheep Was Involved

( Let's put the text of the article under a cut, shall we? )

So, you know, there's a potential research rabbit hole to dive deeper into.