So... what? These people are picking up something that looks like COVID-19, but isn't? The COVID-19 tests are missing something like 90% of the people who have it? Or what?
> These people are picking up something that looks like COVID-19, but isn't
> The COVID-19 tests are missing something like 90% of the people who have it
As far as I know (I'm not an expert) either of those are possibilities, and it's too early to know for sure.
Edit: This comment mentions the possibility of there being 2 types of the virus that spread at different rates: https://news.ycombinator.com/item?id=22489599 Maybe the 10 people monitored in the US had the less contagious version? There are a lot of unanswered questions right now.
It's flu season. The symptoms of mild Covid-19 which were sufficient reason for the CDC to test close contacts of infected people are also basically just the symptoms of the flu or a cold or probably any number of other things.