At 11:59 p.m. tonight, we move to the highest alert level, 4, and we as a nation go into self-isolation. The trigger: early evidence of community transmission of COVID-19 in New Zealand. But unlike so many other gravely inundated countries, we have a window of opportunity to stay home, break the chain of transmission, and save lives. It's that simple. In this fight against the virus, we have some things on our side. We are moving into this next phase of our response early ahead of any potential overrun of our hospitals, ahead of any deaths on New Zealand soil, but that does not mean we should be complacent, and that's why we must take this period of self-isolation deadly seriously.