I have two concerns about expecting China's successful response with regards to these numbers. First, can every country, especially the U.S. expect to have a similar ability to set a mandatory quarantine? Im not so sure this is enforceable, and if it isn't then the same results should not be expected. Second, is this not going to resurface in China once the quarantine is lifted and normalcy begins to reappear?
To your first point I think that it's not really comparable, because society operates so differently. We don't tend to have such close knit family units as you see in lots of Asian countries with lots of people under the same roof rapidly infecting each other, but our patterns of behaviour are different in ways that may encourage spread. I think a behavioural scientist would be able to better answer that, but we already live a pretty isolationist existence in many ways - we talk via email and phone rather than in person, we do our shopping online, we don't even get out of our cars to buy our coffee. I think that we can limit social contact pretty easily if we put our minds to it, and in many ways already have.
On the second point I honestly don't know. I haven't heard talk of it but I don't have a strong enough knowledge of the science to answer. I do however have a friend who's an immunologist with whom I'm chatting on an ongoing basis, so I'll ask the question and let you know what he says.
