Good hand washing technique can combat the transmission of major global killers such as diarrhoeal disease and flu, as well as hospital-acquired infections such as Clostridium difficile.
A new study by the London School of Hygiene And Tropical Medicine shows people are more likely to wash their hands when they have been shamed into it.
Do you wash your hands properly? Children at Knights Enham Junior School, Andover, show you how.
After rubbing an invisible "germ" cream on their hands, the children go and wash it off. A UV light box shows how well they have done by highlighting the improperly washed areas where the cream is still present.
In between fingers, wrists and under nails prove problem areas.