Sure, television is fiction, but this just goes too far. Surely they know that anything medical on a fictional show is immediately assumed to be true, even if the show is The Bill.
Why don't they just abandon all pretense of reality and have a ghost or zombie plague of house robberies and murders? Or better yet, they could install a special crack-squad of vampires to deal with night-time criminal activity. They could write all kinds of storylines based on locker room squabbles (leaky blood bags: a spilt snack or an infection control nightmare?), inter-species romantic interests and workplace discriminations based on dentition.
It might make it more interesting. ;)