On March 5th, Tegnell predicted that the peak in Sweden was going to be on March 9th or 10th (see
https://www.aftonbladet.se/nyheter/a/9vdbWd/tegnell-backar-coronakulmen-pa-mandag-eller-tisdag ). On March 10th, Sweden had a cumulative case count of 355. Now it has had 78,166 confirmed cases. He was clearly way off in his understanding of the risks posed by the disease. Way off.
Denmark+Norway combined population of about as many people as Sweden (and a similar density). They are similar countries in many respects. Stockholm is bigger than Copenhagen or Oslo, but each of these 3 cities have populations under 1 million. London's population is almost 9 million. It's way off-base for Tegnell to try to say that the UK is the appropriate comparison.
At the time Tegnell made that prediction Sweden had 94 confirmed cases. On that day, the Denmark+Norway case count was (10+87 = 97). If you fast forward 2 weeks from then, to March 19, the death counts were 11 for Sweden and 13 (6+7) for Denmark+Norway. So, in terms of surveillance, it looks like the level of surveillance failure for Sweden was pretty similar as its two closest neighbors. I don't really see evidence that they were treating the disease much different before this point. And the Denmark+Norway combo vs Sweden seem to have done similarly poorly in terms of early detection.
In early March, Sweden's strategy diverged from the rest of Europe. Since then Sweden has had about 5,300 deaths, while Denmark+Norway have added another 870. Sweden is in the "top 5" per capita death rates for countries with over 1 million people (there is a lot of scatter in data from tiny countries; Andorra and San Marino both have higher death rates than Sweden now, according to Worldometer, making Sweden 7th out of the 215 countries they track).
It's great that the number of cases and deaths in Sweden are low now. I hope those trends hold.
It would be great if there was some pre-existing immunity that lowers the herd immunity threshold. Evidence for that still seems pretty thin, but I hope that it pans out.
It's possible that the rest of Scandinavia will catch up with Sweden in terms of deaths per capita eventually. But at their current death rates, it would take years even if Sweden has no more deaths. Given the improvements in treatments, delaying infection can save a lot of lives. So, it seems to me that Norway and Denmark have done a much better job (but as for the "best approach" in the thread title, it seems like South Korea or New Zealand are the obvious candidates).
Note: I used numbers from John Hopkins above. If you compare to excess deaths (
https://ourworldindata.org/excess-mortality-covid ) the picture doesn't change appreciably:
Sweden (3/17 - 6/22) 5,334 reported COVID-19 deaths; 5,322 excess deaths.
Denmark (3/24 - 6/8) 561 reported COVID-19 deaths; 259 excess deaths.
Norway (3/31 - 6/22) 220 reported COVID-19 deaths; -134 excess deaths.
(Note: the excess mortality data lags. And these #'s are not over exactly the same time frame, but they are close).
Edit: Typos "too" -> "two" and "a years" -> "years" fixed. "770" -> "870" for the D+N deaths. "D+S" -> "D+N"