The Dracula/blood connections have come up a few times on this site, and I contributed one thread about it a few years ago, in which some of the literature on the subject equates the use of blood with repressed sexual imagery of the Victorian Era:
https://www.jehovahs-witness.com/topic/124690001/connections-between-blood-transfusion-sexual-repression-victorian-age
I took a literature class in college about the Dracula imagery that sparked my interest in the subject.