I think that this article (https://www.theguardian.com/global-development/2020/feb/06/hidden-coronavirus-cases-could-thwart-containment-efforts-experts-warn htt

I think that this article (https://www.theguardian.com/global-development/2020/feb/06/hidden-coronavirus-cases-could-thwart-containment-efforts-experts-warn 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.