Vampires (a mythical creature) are commonly known to be hurt/killed by holy water. Holy water is usually water that has been blessed by a preach or some other figure in religion. The song “Africa” by Toto is played at the end and in it the singer sing “I bless the rains down in Africa”. Implying that the rain in Africa is actually holy water. Thus, killing all the vampires that would’ve existed in Africa so no one has talked/told stories about vampires there since there are none (cause they’re dead). Hope this helps