In viral infections, changes in the blood picture are also known as blood cell changes, which include mainly white blood cells and platelets. The white blood cell count usually remains normal or decreases slightly, but can rise significantly in the presence of bacterial infections or certain viral infections. It is common to see a slight increase in lymphocyte count when the neutrophil count returns to normal towards the end of the acute course of the disease. However, it also depends on the specific type of viral infection, if it is chronic hepatitis B, chronic hepatitis C and other chronic viral infections, there is often no significant change in the blood count, except in the case of cirrhosis and splenomegaly, the white blood cell count may drop to a certain extent because of the increased destructive function of the spleen. In viral infections, if the corresponding consumption is relatively large, the condition is more acute, and the fever is more severe, there may also be a drop in platelet count.