Comment by Yver

> The per capita rate is far lower than nearby Denmark or the Netherlands (if higher than the negligible rates in Norway and Finland).

According to this article, Sweden's per capita infection rate is far lower than Denmark and the Netherlands, and slightly higher than Norway and Finland. Compare that to population density: (numbers from Wikipedia)

    Netherlands: 521/km²
    Denmark:     137/km²
    Sweden:       25/km²
    Finland:      16/km²
    Norway:       14/km²

Not so coincidentally in my opinion, Sweden has a far lower population density than Denmark and the Netherlands, and slightly higher than Norway and Finland.