One interesting thing about Sweden that seems to fly over everyone's head is that they spend a significant amount of effort promoting health in public schools.

One interesting thing about Sweden that seems to fly over everyone's head is that they spend a significant amount of effort promoting health in public schools. So you have generations of people who are taught to focus on their well-being for the rest of their lives. This is likely one of the major reasons why socialized medical system works in Sweden. Soviets did the same thing and even promoted health at work places by instituting Sanatorium breaks for employees. So, with that said, we're probably talking about a sub-group of people with better natural immunity than some other surrounding countries in the area.