Maybe it's just concentrated on poorer parts of the population? Generally poorer people tend to live closer together and can't afford staying home when they're

Maybe it's just concentrated on poorer parts of the population? Generally poorer people tend to live closer together and can't afford staying home when they're sick. Immigrants tend to be poorer in most countries, including Sweden. I'm not sure how it helps to name place of birth for infected, finding out the actual factors determining the spread would be more helpful.