if someone thinks about the whole STD thing, vampires are supposedly kinda "dead", so they wouldnt get sick, but drinking sick people's blood could make them (in theory) carriers, but they would not get sick themselves, so Mavis could carry STDs, she just wouldn't get any effects
if someone thinks about the whole STD thing, vampires are supposedly kinda "dead", so they wouldnt get sick, but drinking sick people's blood could make them (in theory) carriers, but they would not get sick themselves, so Mavis could carry STDs, she just wouldn't get any effects