AIDS is not a blood disease; it is a particularly dangerous infectious disease, caused mainly by the AIDS virus. Mistaken for a blood disease, mainly because it destroys the CD4T lymphocytes in the human immune system, capable of destroying a large number of these cells, thus causing the human body to lose its immune function, but it is essentially an infectious disease. Due to the destruction of the immune system, the body’s resistance to decline, so there will be a variety of infections, such as the more common herpes zoster infection, oral mycobacterial infections, tuberculosis, as well as some of the special pathogenic microorganisms caused by enteritis, encephalitis, pneumonia, Candida, as well as Pneumocystis carinii and other many kinds of pathogens caused by a serious infectious disease. Malignant tumors, such as lymphoma, Kaposi’s sarcoma, etc., often occur in patients with advanced disease.