This has been obvious for months -- Romer has been yelling from the rooftops about it -- and yet no major western govt save the Brits have attempted to even try this strategy. Madness.
Because the more effective and proven strategy is to simply pay businesses and people to lockdown. It has been effectively eliminated in both Australia and NZ this way. And the impact to the economy is significant but it's turning out to be far less severe than the rest of the world and their on/off again strategy.
China moved on from lockdowns over 6 months ago. They switched to citywide testing with 5:1 and then 10:1 pooled PCR tests in May and then recently switched to pooled rapid antigen testing. With the current testing methodology, they place one sample on a test strip, wait to see if there's a color change, and if not, they'll put a subsequent sample on. You can use a single antigen test for up to 10 people and patients get their results while at the testing site.