When we're out in public we can touch up to 300 surfaces in only a 30-minute period, US bleach manufacturer Clorox says. And this of course puts us at risk of picking up the potentially harmful germs that may be lurking there.

The World Health Organization recommends taking care when in places large numbers of people congregate. "Especially when they are eating food," WHO says, "there is a greater risk of the spread of diseases such as cholera, hepatitis A, typhoid and other diarrhoea diseases."

Here's where you might need hand sanitiser!