Saliva does not transmit AIDS, because saliva does not contain HIV, and even a small amount of HIV in saliva is not enough to cause infection, so saliva does not transmit AIDS. AIDS is a blood-borne disease and it is transmitted to others through blood and body fluids, including semen, prostate fluid, vaginal secretions, cervical secretions, pleural fluid, ascites, cerebrospinal fluid, breast milk, etc. These body fluids all contain a relatively high level of the virus. If the patient’s blood or body fluids come into contact with a healthy person’s wounds, it may cause infection to the healthy person, so the healthy person should try to avoid contact with the blood and body fluids of the AIDS patient in the process of getting along with the AIDS patient.