[svckr]

> In American medical slang, a zebra is a rare and exotic condition that can be conflated with more common ailments

"It's never lupus."

I'm surprised I can't remember that term coming up in House MD. It's an interesting analogy, and this sounds like an extremely interesting talk, but one has to be aware (as the author obviously is) that these conditions are rare and should only be taken into account once the more common potential causes have been ruled out.