I wonder, does this somewhat explain Italy? My point is: cultures, where personal space is smaller and contact is more frequent are at higher risk of transmitting the virus. Or is this complete bollocks?
I don't know about Italian culture, but in general your statement is true.
Another cultural thing affecting virus is when it's not considered appropriate to stay home with cold or other diseases, rather you're expected to work, of course spreading virus to everyone else. I've heard about Japan, but probably there are plenty of other countries with similar approach.