It is possible to be bitten by an AIDS patient and actually contract AIDS, but the probability of such an infection is very low. For such an act to be infectious, the skin of the healthy person who is bitten must be broken. Blood must be present in the mouth of the AIDS patient, because the saliva of an AIDS patient does not usually contain the virus, and even if it did, it would not cause transmission of AIDS. Therefore, in order to cause infection, blood must be present in the mouth of the AIDS patient, and only when the blood enters the body of a healthy person who has been bitten can the infection be caused in a healthy person. However, if you are bitten by an AIDS patient, you should take HIV blocking medication as soon as possible for safety reasons to avoid contracting AIDS.