In BTVS they can. There’s a vampire who’s cursed with having a soul and is therefore unwilling to hurt humans, so he just toddles down to the butcher and gets blood from them.

Soulless vampires either like the hunt or just prefer the taste of human blood. For instance, some vampires just raid blood banks instead of hunting humans.

Covid just made us all realise we know a lot more people than we thought we did who would hide a zombie bite.

Just because someone is unsuccessful in killing you doesn’t mean it’s okay that they continue to try though.