Being Careful about where they get their blood

so, vampires technically can drink from animals, but they don't get as much blood and it is considered to be of a worse quality (although some wilder vampires actually prefer it). But, if they do something like, say, drink from a poisoned animal, then the poison will not react well to their dead body. If they drink from a sick human, they might get the illness, depending on what it is. So as long as their careful, their fine.