Ugh, four humors nonsense. [Alucard's scoffing says everything that need ever be muttered on that particular topic.]

It's...an interesting theory, if a very unsafe and unsound one. I'd have expected simple blood poisoning, but it seems like there were greater side effects. [He tuts softly, then nods. This'll do for now.]

There was no thought about means to filter out toxins and purify blood during the transfusion process?