HIV has been identified in various body fluids but it is especially highly concentrated in blood, sexual fluids (semen and vaginal fluids), and in breast milk.

Although HIV is present in saliva, tears, sweat and urine, the concentration of the virus in these fluids is very low, and transmission is unlikely.

Note: saliva containing blood (e.g. in dental contexts, or when there are open sores, thrush, or loose teeth in the mouth) can transmit the virus.