One thing Australia can offer is insight of how quickly the virus spreads from a single case. There's so little COVID out there that we trace the fuck out of it, and
Below is a map of the current Melbourne outbreak. We'd had zero cases for a couple weeks, then had a pair of covid positive removalists come to pack up an apartment in Melbourne.
They had the delta strain, and have COVID to 4 people in other apartments in the complex on the same floor. One of those guys went to the footy and gave it to 6 people in the bay of the stadium he was sitting in, 1 of those 6 went to the rugby the day after and it took off from there.
We found the removalists cases on day 1 ( 3 days after they'd done the job), 10 new cases on day 2 and announced a lockdown with another 12 cases on day 3. That was all that was known about at the time we locked down, and yet in every case in yellow on the chart below was already positive by that point, just had not been found and contained.
Today was the 7th day we've been locked down and announced 26 new cases, but 24 of them had been in quarantine for 100% of their infectious periods, so no risk to have spread it further... Current plan is to reopen in 4 days time provided all detected cases were in quarantine for their entire infectious periods.
That's 3 lockdowns this year for Melbourne, which have been 5 days, 14 days and (fingers crossed) 11 respectively.