"Rabid" is a term primarily used to describe an animal, often a dog, that is infected with the rabies virus. This viral disease affects the central nervous system and is usually transmitted through bites or scratches from an infected animal. Symptoms in animals can include aggressive behavior, excessive drooling, and paralysis. In a broader context, "rabid" can also refer to extreme enthusiasm or fanaticism about a particular subject, such as a sports team or political ideology. In this sense, it describes someone who is fervently passionate, often to the point of being unreasonable or irrational in their views.