Acquired immunodeficiency syndrome, often referred to as AIDS, is an infectious disease caused by infection with the human immunodeficiency virus. After infection with this type of virus, the human body will violate the immune system, leading to a decline in immune function, causing a decline in CD4 cells, which can lead to various opportunistic infections and tumors. Therefore, AIDS patients need to be treated promptly. After antiviral treatment, the immune function of most patients will gradually increase, and the number of CD4 cells will also gradually increase, so the chance of opportunistic infections will be significantly reduced.