 Two babies in separate delivery rooms delivered by separate staff become deathly ill within minutes of birth. Even though there s no way to explain how an infection could spread between them so quickly, the team must find some way to prevent an epidemic they can t yet identify. In chasing the killer, House must make a choice: give both babies the same treatment and loose both if he s wrong, or give them separate treatments to assure a positive ID of the illness, but also assuring that one of the babies will die.