Viral load (VL) represents the viral load, i.e., the amount of virus replicating in the body, and is simply measured so as to show the amount of virus per milliliter of blood. The level of viral load is a marker of disease progression and is of great value for disease staging, prognosis, and efficacy. Recently, the rapid spread of the viral strain Delta has been attributed to the production of more virus in humans with the Delta mutant strain, with a viral load 1260 times higher than that of the original strain, making it potentially more infectious in the early stages of infection. At the same time, the virus survives in the body, that is, the virus remains positive, for a longer period of time than before. In the face of an aggressive delta strain, it is more important to protect yourself. In the case of a normalized epidemic, you should do “five more”. That is, masks should be worn, social distance should be maintained, coughing and sneezing should be covered, hands should be washed frequently, and windows should be opened as much as possible. For example, before going on a trip or business trip, you should make reasonable travel arrangements, avoid going to high-risk areas in the epidemic, and pay more attention to the epidemic.