Final answer:
Sexual contact is most likely to lead to transmission of HIV FROM an HIV positive partner.
Step-by-step explanation:
The action most likely to lead to transmission of HIV from an HIV positive partner is unprotected sexual intercourse, particularly an*l intercourse, which has a higher risk of transmission. Sexual transmission is the most common way HIV is spread, with heterosexual contact being a significant mode globally and transmission in the United States.
Other significant modes of transmission include through contaminated blood, particularly via unsafe medical injections, needle sharing during intravenous drug use, and transfusions with contaminated blood or blood products.
It's essential to understand that the presence of other sexually transmitted infections, particularly those causing open sores, can increase the risk of HIV transmission. This risk is further heightened during the early stages of HIV infection when the viral load is typically the highest in an individual.
Methods to prevent the spread of HIV include consistent use of condoms, which can reduce sexual transmission to less than 1 percent per year amongst couples where only one partner is infected. Despite myths, HIV cannot be transmitted through casual nonsexual contact like kissing or sharing a glass.