Eating a bite of something that someone else has bitten is generally not contagious, but if there are mouth ulcers and other broken, then the possibility of infection can not be ruled out. Eating a bite of something that someone else has bitten is generally not contagious, and the main ways of transmission of AIDS are sexual, mother-to-child, and blood transmission, not including saliva transmission. Therefore, even if a person infected with HIV takes a bite of food, and other people go on to eat it, it will generally not lead to HIV transmission. However, if there are mouth ulcers or other broken sores, the body fluids of the HIV-infected person may carry the virus, which can enter the bloodstream through the ulcers, thus causing transmission of the virus. It is therefore recommended to consult a doctor for infectious disease tests and to follow the doctor’s instructions in such cases.