The absence of symptoms in patients infected with the novel coronavirus is mainly related to the degree of immune response of the infected person. By suppressing the growth of the virus before it can do much damage, the human body does not respond significantly. If we consider the invading virus as the “enemy army” and the immune cells as the “our army”, when the viral load is low, i.e., the “enemy army” is weak and the immune cells are strong, we can suppress the growth of the virus before it can do more damage, or even put it out quickly. When the viral load is low, i.e., the “enemy army” is weak, and the immune cells are strong, the growth of the virus is suppressed or even extinguished quickly before the virus can do more damage. This type of infected person should pay attention to self-monitoring, self-isolation, and the health status of the surrounding people, and if the nucleic acid test is positive, isolation and hospitalization should be carried out to avoid widespread transmission.