"Euphoria: Part 2," airing May 3, 2006, concludes a high-stakes House storyline where the team races to diagnose Dr. Foreman with Naegleria fowleri (primary amoebic meningoencephalitis) contracted from contaminated water. The episode features intense ethical dilemmas, including the use of an illegal marijuana cistern as the infection source and Dr. Cameron performing a high-risk brain biopsy to save Foreman. Read the full episode details on the House Wiki .