Dracula drinks Lucy's blood, eventually killing her, and she becomes a vampire. Drac drinks Mina's blood and doesn't kill her, and she just gets sick and frail. After he feeds her his blood, she gets the psychic link to him and starts becoming a vampire. I think that implies that A: to make a vampire he either has to kill them after drinking their blood or drink from them and then feed them his blood, and B: Renfield has been fed Dracula's blood,but Dracula hasn't fed on Renfield to turn him completely.












