2019 Novel coronaviruses are transmitted primarily through droplets. Because droplets do not stay in the air, they will eventually fall to the ground and dissipate, so there is a safe distance. The safe distance recommended by the Wuhan Health and Wellness Commission is 1m, and less than 1m forms a close contact. After close contact with the source of infection, exposure is formed and there is a risk of infection. However, the CDC recommends a safe distance of 6 feet, about 2m, for novel coronavirus pneumonia.