self reported compliance means nothing, even if it is 98%.Again, it depends on what the definition of "work" is. The only country to deploy a true trace program was South Korea. Look at what Korea did starting in November. There's also a clear line where the Delta makes it worse.
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South Korea COVID - Coronavirus Statistics - Worldometer
South Korea Coronavirus update with statistics and graphs: total and new cases, deaths per day, mortality and recovery rates, current active cases, recoveries, trends and timeline.www.worldometers.info
Japan did not have a trace program. It's tracing was a disaster so that's more B.S. that you are spouting without knowing the facts on the ground. If you are claiming Japan and South Korea did similarly, then you have to discount for trace which was not part of the Japanese equation due to a poor testing program.
That leaves you with masks + distance (or disavowing Japan now despite citing them earlier). Europe had a high mask compliance and harder lockdowns. Why didn't it work there? (oh yeah, you said it's because they relaxed). Well, Los Angeles had indoor and outdoor with over 98% compliance and closed indoor dining....why didn't it work there? Oh yeah, you said it was because of density....but Seoul, Tokyo and Singapore are also equally dense.
So the answer isn't "tracing". The answer also can't just be 100% "masks". And the answer can't just be well Los Angeles is different because of density. It has to be something else.
Look back to the Nigeria study on mask use. (referenced in the bangladesh study). Self reported mask use was 90%. But, if you actually went to Lagos and looked at people, 10% had masks on.
We all wash our hands with soap, too. Just ask us. But don’t ask the guy who changes the soap dispenser.