My studies from watching movies conclude that vampire saliva causes the infection for example if they bite the girl and the hero bursts into the room and scares the Vampire off. But if they drink all your blood you die before the infection spreads, for example the vampire chronicles. So it is up to the Vampires how many they want to create and they create just enough to not cause a major problem.
“My studies from watching movies conclude that vampire saliva causes the infection for example if they bite the girl and the hero bursts into the room and scares the Vampire off.”
I, personally, rarely see such movies. If there is something passed between the vampire and his female victims, it’s usually akin to sexual desire. As if they’ve been “infected” by eros. What you describe is, I’m willing to believe, part of the myth of this or that story. “I Am Legend,” for instance, presents vampirism as a plague which converts people into vampires if they die from the disease. most of humanity converts, while some of them survive and one lucky or unlucky fellow is immune.
However, the much more popular version, and the one in most every movie I’ve ever seen, has the vampire consciously choosing, via whatever mechanism, to convert the victim. Most of the victims never turn at all, to be sure.
“most every movie I’ve ever seen, has the vampire consciously choosing, via whatever mechanism, to convert the victim”
By which I mean to say they have the victim drink vampire blood before they die, or whatever.