It starts with a fever. A splitting headache. Vomiting, fatigue, an earache— then the secondary symptoms begin. Vision loss. Stiff neck. Lethargy, confusion, inability to walk, an aversion to light. Hallucinations. Doctors scramble to make a diagnosis, attempting treatment for bacterial meningitis, viral encephalitis, herpes, or other rare diseases, but nothing works. Finally, a coma. Death follows within three days.