The medium term answer is fairly simple: test, test, test. Test people at the first hint of systems, and isolate anyone positive along with everyone they’ve had contact with for the previous week. Test everyone who’s had symptoms - heck, even those who haven’t - for antibodies to the virus, so we know who’s already immune and safe. But just like everything else, reliable tests in sufficient quantities to cover an entire population take time - so right now the right thing to do is just. Stay. Isolated.
