Well, in the US but South Korea, Taiwan, Vietnam,Singapore, Australia, and New Zealand as examples are doing a pretty good job with tracing and isolating to kee

Well, in the US but South Korea, Taiwan, Vietnam,Singapore, Australia, and New Zealand as examples are doing a pretty good job with tracing and isolating to keep the virus contained without much lockdown. And I'm probably unfairly slighting some countries by leaving them off that list but those are the ones that come to mind as generally figuring out who has the virus and how they got it. In places like the US and Europe, of course, who knows how any given person passed it on.