In 1996, physician R. Michael Benitez published a clinical argument that Poe's documented final symptoms — fluctuating consciousness, visual hallucinations, an inability to tolerate fluids, tremors, and terminal neurological collapse — were consistent with a specific fatal disease rather than alcohol poisoning or assault. His argument rested critically on one symptom that Moran's notes described: a particular aversion or difficulty involving fluids that is, in the paralytic variant of this disease, sometimes observed without the classical fear response most people associate with the condition. What disease did Benitez propose, and what is the name of the classical symptom he argued Poe exhibited in an atypical form?