So what are the categories of FUO, Sebastian, that you read about?

Yes.

So there are four main categories of FUO.

The first is classical FUO, which I just covered with the regular criteria that I had just mentioned.

And then the second main type is nosocomial or hospital-acquired FUO.

And so these are fevers in hospitalized patients that present to the hospital without an infection.

So that's the second main type.

So that's why we cannot overstate the importance of history and physical, right? Oh,