The high white blood cell count in routine blood tests may be caused by high neutrophils. Neutrophilia can be seen in acute bacterial infections, especially some septic cocci. In addition, acute poisoning, hemorrhage, severe tissue damage, or neutrophil proliferative leukemia can lead to an increase in neutrophils. The increased white blood cell count may also be caused by an increased lymphocyte count, which can be seen in some viral infections. 3, Monocytosis can also be seen, such as mononucleosis caused by EBV infection, which can lead to an increase in monocytes, resulting in an increase in the total number of white blood cells. 4, Other causes of increased white blood cells may also be eosinophils or basophils. Acidophilic granulocytes or basophilic granulocytes, some allergies, parasitic diseases, skin diseases or blood diseases, may lead to such an increase in white blood cell count. However, the majority of cases are caused by increased neutrophils or lymphocytes, as acidophilic and basophilic are usually low, and even if they are elevated significantly, they usually do not lead to a particularly high white blood cell count.