A white blood cell count of 3.3 in the clinic mainly refers to a white blood cell count of 3.3×10⁹/L. It may be suffering from certain diseases, such as viral infection, aplastic anemia, etc.; and it may be taking certain drugs, such as cyclophosphamide, etc., which need to be analyzed according to the specific problems. 1. Suffering from certain diseases: for example, viral infection, aplastic anemia, acute lymphoblastic leukemia, etc.. The common viruses that cause leukocyte count of 3.3×10⁹/L are hepatitis virus, influenza virus, etc. Aplastic anemia leads to leukocyte count of 3.3×10⁹/L, which is mainly due to the decrease of leukocyte production. 2. Taking certain drugs: for example, cyclophosphamide, methimazole, etc., can inhibit the hematopoietic function of the bone marrow, thus reducing the number of white blood cells. If you have a white blood cell count of 3.3×10⁹/L, it is recommended that you go to a regular hospital as soon as possible to clarify the cause.