House explains that dogs have fleas, and some fleas in the southwest carry the plague. In very rare cases, House says, the plague can cause sleep disturbances. So not only did Hannah get the plague through an extremely unlikely set of circumstances, but she also got a really weird plague that's impossible to identify without losing a liver and being in incredible pain for eleven days first? Karma not only bit Hannah in the ass, it shoved a six-foot-long tube up it. The buboes that make the plague so readily identifiable didn't show up because of the steroid she took for the poison ivy and all that other stuff they were giving her once she got to the hospital. So once again, House's method of treating a patient before diagnosing her backfires. As soon as they stopped the immunosuppressants, the bacteria went flooding to Hannah's lymph nodes and the bubo appeared. Hannah will be fine after they pump her full of antibiotics and immunosuppressants. She'll even be able to keep her Liver of Lies. House sends the Cottages out to do all of this, as well as make sure that plague-carrying dog is tracked down and, presumably, the rest of the PPTH staff is informed that they may have come into contact with something that killed about a third of Europe once. Hannah finally speaks: "I've got the plague?" she asks, looking kind of pissed off. I know I'd be pissed off if I managed to get the freaking Black Death. "Don't worry," House says, "it's treatable. Being a bitch, though...nothing we can do about that." Hannah scowls, because she has been BURNED. Nice one, House.