The Fall of the House of Usher

In this story, Poe hints at vampires most obviously in the part of the story where there is a heavy storm and the narrator hears the noises. While he is reading, there are awful noises coming from somewhere in the depths of the mansion. Usher realizes that these noises are the sounds of Lady Madeline, his twin sister, escaping from the coffin/chamber/vault that the narrator and Usher had buried her in eight days prior to this. Usher describes how he had been hearing these noises for the past few nights, but hadn't mentioned that they mistakenly buried her alive. Suddenly she's in the room and falls over and kills Usher, and the narrator flees the house. There are other hints at vampirism, such as when Usher becomes withdrawn and tells the narrator to stay in his room at night. I'm almost positive that there are other signs in the story that I missed, but those are the two main examples that I could find.