On a relate note to that question, since I have previously mentioned that I was expecting to get a better sense of pandemic potential in Feb/by the end of Feb, here is a brief mid-month report on where my thinking is at.
The threshold of inevitably has still not quite been crossed for me. But it remains only a step or two away. Nothing has happened or been discovered that makes me think a pandemic is less likely, quite the opposite. Everything from the various China numbers, numbers in some other countries, test capacity and reliability issues, anecdotes and reports on mild and asymptomatic cases, and what stages a risk of infection may be present during, makes containment harder.
I was previous working with some binary assumptions in mind, in the sense that I was thinking that the attempted containment phase, if it became obviously unsuccessful/a lost cause, would simply be abandoned and we would move on to a pandemic phase with very different restrictions and priorities. But it now seems possible that even if full containment is deemed a lost cause, we might have a lengthy period where various countries are still engaging in various forms of isolation, in order to attempt to slow the spread. But there is probably not much point saying more on this unless such a phase actually happens.
Some countries look like they have obvious potential to be the ones to bring us news and a change of message from the authorities that will indicate we have reached a new phase. As I have mentioned previously, Singapore has already set the scene for this with various public statements, and their statistics about cases they havent managed to connect to known clusters of outbreak are one to watch. Japan is another one to watch, not because of the disgraceful cruise ship situation and infections, but because of some cases popping up in various locations that might be signs of broader community spread. But I have some more reading to do on that one, some very recent official comments from Japan seem noteworthy but machine translation of Japanese to English isnt great, so I am not ready to talk about the detail of this properly yet at all. The USA might also end up acting as a useful beacon because I believe I read that they are now starting a broader detection effort in 5 locations. They will test people in these places who present to healthcare facilities with certain clinical symptoms (eg pneumonia) who dont fit any of the other criteria (travel to certain places, contact with known cases) and in this way, any broader community spread should eventually be detected. Of course it could also be events and discoveries in any other country that signal the need to move to a new phase, including the UK, but in the meantime the countries I just mentioned are where I will direct a lot of my attention.