Switzerland has a population highly concentrated in cites and villages where single family homes are very rare. Lived there in 2008 - 09 in a small village outside Zurich. Mostly apartment or condo type housing. At best duplexes. Small and very expensive, spent a lot of time outdoors and most people do, so likely even if tried to be isolated would come close others on walks. Most people use trains so that would likely also play a part.
“Most people use trains so that would likely also play a part.”
Yeah, Switzerland is very anti-car. At least according to Jeremy Clarkson
for switzerland, covid-19 does not appear to be a function of density or culture per se, as the article and map linked shows:
as of the date of the article (march 19), the most cases seem clustered at selected national border cantons— basel-stadt, geneva/vaud, and ticino. zürich, for example, seems relatively untouched by comparison (and it has an extensive tram system).
Public transportation. Boom... if only the media would tell that truth. This is spreading faster where public transportation is common. That includes buses also. Viva la rural life.