It is possible to contract novel coronavirus pneumonia even in patients who have not been exposed to novel coronavirus. This is because the novel coronavirus can be transmitted by respiratory droplets and also by contact. Patients with novel coronavirus can cough or sneeze, releasing large amounts of droplets containing coronavirus that can be left on the surface of objects such as elevator buttons, door handles, tables, etc. When a healthy person touches these droplets with their hands, they can become infected. When healthy people touch these objects with their hands, and then touch the eyes, nose and other mucous membranes with their hands can also cause infection. So to prevent infection with the new coronavirus, we must wear a good mask in addition to washing our hands, avoiding rubbing our eyes and nose with our hands.