by Stephen Matthews
Shoes are packed full of harmful bacteria picked up as people travel and these can multiply and spread on carpets and floors.
And just touching the infected surface could land you on the toilet for a couple of hours with the embarrassing stomach bug.
Study author Professor Kevin Garey said: 'It's amazing how far humans travel during the day, and all that walking drags in germs and bugs.'
A pro-shoes off story in the Daily Mail, the Darth Vader of tabloid newspapers. I absolutely hate the Daily Mail with its pro-Brexit stance and its hostility to immigrants. However, it's probably true that a lot of the readers of the Mail keep their homes shoe-free. This is where class comes in.
A lot of people with shoe-free homes are young, trendy, professional hipsterish people (like me?). However, a lot more are what you might call upper-working class people. Skilled manual workers and successful small business people. People who have done well for themselves and have nice homes. Such people have lovely white carpets and don't have the social pretensions that would keep posher, more middle-class people from asking guests to take their shoes off. Those are not the sort of people I would get on well with if we had a conversation about politics, but I'm definitely with them on taking your shoes off at the door.
Some of the Trump supporting Americans who follow me on Twitter favorite my tweets on removing shoes. They are probably a similar sort of people to those Daily Mail readers who keep shoe-free homes.
Yes, we British really are obsessed with class.