<Li> After washing and drying hands with a paper towel, the total number of bacteria was reduced on average on the finger pads by up to 76% and on the palms by up to 77% . </Li> <P> The scientists also carried out tests to establish whether there was the potential for cross contamination of other washroom users and the washroom environment as a result of each type of drying method . They found that: </P> <Ul> <Li> The jet - air dryer, which blows air out of the unit at claimed speeds of 400 mph, was capable of blowing micro-organisms from the hands and the unit and potentially contaminating other washroom users and the washroom environment up to 2 metres away . </Li> <Li> Use of a warm - air hand dryer spread micro-organisms up to 0.25 metres from the dryer . </Li> <Li> Paper towels showed no significant spread of micro-organisms . </Li> </Ul> <Li> The jet - air dryer, which blows air out of the unit at claimed speeds of 400 mph, was capable of blowing micro-organisms from the hands and the unit and potentially contaminating other washroom users and the washroom environment up to 2 metres away . </Li>

What are the four (4) hand hygiene definitions