As I understand it the rhinovirus can spread around 3-4 feet, droplet respiratory infections generally spreading 3-6 feet. It occurred to me that personal space varies widely across cultures so I was wondering if viruses in regions which have a greater personal space standard have selected for more virulent features such as hacking coughs.
This graph is supposedly in 1/12 inches, but I believe they meant 1/12 foot. Given this, Scottish people's average social conversation distance may just be enough to prevent them from catching rhinovirus [1].
I wonder if anyone has done research on this. It would also be interesting if different strains took foot hold in regions dependent on social distance. I doubt you would be able to distinguish this likely minor variable from other factors such as population density, climate, sanitation, etc., but I thought it was an interested idea nonetheless.
[1] http://homepage.ntlworld.com/gary.sturt/environment/personal%20space/personal%20space.htm
http://homepage.ntlworld.com/gary.sturt/environment/personal%20space/personal%20space_files/image004.jpg