The probability of transmission from a patient with AIDS to another person through saliva is minimal. It is important to understand the concept that the saliva of an AIDS patient usually does not contain the virus, and even a small amount of the virus is not enough to cause transmission. There is no chance of HIV transmission through saliva, unless the patient has a lot of bleeding in the mouth, and blood and saliva mix together and come into contact with a healthy person’s wound through the mixture of blood and saliva, which itself is very unlikely. Even if a healthy person eats food containing a mixture of saliva and blood from an AIDS patient, the mixture of blood and saliva in the digestive tract of a healthy person will hardly cause infection.