Epidemiological seven-step washing method refers to the seven steps of hand washing, which can be summarized as “inside and outside the bow large standing wrist”. The first step is to apply hand sanitizer with palms facing inward, rubbing palms and fingers together. The second step to clean the back of the hands, palms on the back of the hands rubbing each other and alternating hands. The third step is to clean the palm of your hand, palms facing each other, fingers crossed and rubbed along the finger joints. The fourth step is to bend the joints of the fingers, alternating between the fingers of both hands and hooking them. Step 5 Hold the thumb of one hand in the palm of the other hand and rub alternately. Step 6, wash the fingertips, fingertips together in the palm of the other hand palm rotation rubbing, alternating hands. Step 7, wash the wrist, alternating hands. The above steps should be noted that each step lasts at least 15 seconds or more.