Correct Response: B. HIV is the virus that causes AIDS. It can be transmitted only through certain body fluids, such as blood, semen, vaginal secretions, and breast milk. Being sexually involved with an individual who has multiple partners is a risk factor for contracting HIV because the likelihood of coming into contact with the HIV virus increases as the number of sexual partners increases. Having a preexisting or underlying genetic blood disorder (A) does not significantly increase the risk for contracting HIV among sexually active people. Although blood transfusions and organ transplants have been known to transmit HIV in the past (C), today's screening processes of the blood and organs used in these procedures has largely eliminated the risk of contracting HIV this way. By itself, saliva does not transmit HIV (D).
