The Australian case shows that the faster and more comprehensively you shut down interactions, the better your chances of stopping the contagion from taking hold and spreading. I mentioned the severe lockdown in Melbourne's case, but the rest of the country learned from that.
Every time they get an outbreak now—and it does happen from time to time—they very quickly put the whole city down under another lockdown order for three, four or five days. Yes, we get the usual complaints from business groups that they're going to suffer from lost business, but they're being done a favour, because by stopping the contagion that quickly, you're allowing those businesses to reopen. This is where you need government to take a forceful, long-term view and do what's right for the whole community.