[learc83]

>But that could be said about any disease.

With diseases that have been better studied, we have large population studies to determine how many people have been infected for every 1 person reported.

>As is, it is mortality given that you have symptoms which is a pretty good measure to have

We don't know that because we have no idea how many people have mild to moderate symptoms and haven't been tested.

At best it's mortality given that you are severe enough to seek treatment.