Which fluid from an HIV-infected person cannot transmit HIV?

The correct response is based on understanding the transmission routes of HIV. HIV is primarily transmitted through specific body fluids that contain the virus in sufficient quantities to establish infection. Blood, rectal fluids, and vaginal fluids all contain high concentrations of the virus, making them potential sources of transmission.

Sweat, on the other hand, does not contain sufficient levels of HIV to pose a risk for transmission. Research has demonstrated that while sweat may carry trace amounts of the virus, the concentration is so low that transmission through this fluid is highly unlikely. This is a key point in understanding the biological mechanisms of virus transmission and the risks associated with different body fluids. Therefore, recognizing that sweat does not transmit HIV underscores the importance of differentiating between fluids that are infectious and those that are not.