I think that this article (https://www.theguardian.com/global-development/2020/feb/06/h...) illustrate that it is very likely that the symptoms in most people are mild and these people are not seeking medical advice while spreading it around them.

If this is really the case, it is going to be very difficult to contain it.

Feels like some version of Pandora's Box/life (or non-life, in this case) will find a way. We haven't wiped out Polio yet. Actually, there are more coronavirus cases than polio.