They would prolly turn into ghouls.Since Alucard is only half vampire, he can't turn them into full vampires, even if they drink his blood. And ghouls are said to drink blood. The origin of the word is from the Arabic (Ghul) . A Ghul in Arabic folklore refers to a " a desert-dwelling, shape shifting demon that can assume the guise of an animal, especially a hyena. It lures unwary travellers into the desert wastes to slay and devour them. The creature also preys on young children, robs graves, drinks blood, steals coins and eats the dead, taking on the form of the one they previously ate. I underlined the most important part, the one that's related to its habit of drinking blood.
I know that Ghouls have already been portrayed in CV, but not in the way they are in this definition. Still it would be interesting to learn how those humans were turned into ghouls.