HIV and Hepatitis B are primarily transmitted through which method?

The primary method of transmission for both HIV and Hepatitis B often involves direct exposure to infected bodily fluids, which can occur through contaminated needles. This mode of transmission is particularly significant among people who inject drugs, where shared or reused needles can lead to the transfer of blood containing the viruses from an infected individual to an uninfected person.

While sexual activity also poses a risk for transmission, primarily for HIV, the specific context of the question calls attention to the significance of needle sharing in the transmission of both viruses. Other methods of transmission mentioned, such as airborne and vector-borne exposures, do not apply to HIV and Hepatitis B, as these viruses are not spread through the air or insect bites. Therefore, recognizing the crucial role of direct contact through contaminated needles provides a clearer understanding of the transmission pathways for these serious infections.