The virus has already burned through Sweden and, with their immune systems properly exercised over the healthy warmer months, they will weather any possible resurgence in December much better than countries where people didn’t mix it up and are now compromised with little immunity, not just from wuflu, but from regular covid, the flu, bronchitis, strep...
The virus hasn’t “burned through” Sweden - as another post here said, it’s about 6.5% of the population who have already got the virus. Let’s say he’s off by 200% and its really just about 20% who have got the virus.
That, crowd immunity, didn’t happen yet.
About the warmer months, it is doubtful as even warmer countries like Brazil and India are having large numbers of deaths.