Saliva, also known as saliva, does not transmit HIV. Although saliva contains a small amount of virus, the amount of virus is too low to cause infection, so saliva is safe, and the urine and feces of AIDS patients are not infectious. Blood, other body fluids such as semen, prostate fluid, vaginal secretions, breast milk, tissue fluid, cerebrospinal fluid, ascites, pleural fluid, etc., all contain more viruses and are more contagious, so if they enter the body of a healthy person after contact, they can cause infection. Therefore, when you are in contact with AIDS patients, you should avoid infecting your wounds with the blood and body fluids of AIDS patients. If a person with AIDS is injured, the wound should be bandaged and protected to avoid infection to others.