There are two levels of social isolation measures:

First, measures such as suspension of classes, suspension of work, closure of cities, etc., let everyone try to stay behind closed doors to avoid crowds. This mainly relies on the government to lead and can block the spread of the virus on a large scale.

Second, keep a safe distance from people when you have to go out. New Coronary Pneumonia is similar to respiratory and infectious diseases such as influenza and tuberculosis. The virus is mainly spread by droplets, that is, patients spray out droplets containing viruses by talking, coughing, sneezing, etc., and are inhaled by people around them, causing infection.

The diameter of the droplets is generally between 100 and 200 microns, and it is easy to fall to the ground due to gravity, and the spray range is generally not more than 1 meter.