When it comes to calculating risk of HIV transmission, some people can really get fixated on specific percentages. That's not something to condone. But it's still interesting -- and useful -- when studies use those percentages to shed new light on key topics in HIV transmission. Most of the studies involved gay or bisexual men. Our friends at NAM recently summarized the findings in detail. They estimated that HIV transmission risk during a single act of unprotected, receptive anal sex may be 18 times higher than unprotected, receptive vaginal sex: 1.
HIV transmission: Know the facts
Odds of Getting HIV | Everyday Health
The risk of HIV through unprotected anal intercourse is seen to be extremely high, as much 18 times greater than vaginal intercourse. The reasons for the increased risk are well known and include such factors as:. Furthermore, the secretion of blood from damaged rectal tissues can increase the risk for the insertive "top" partner, providing the virus a route of transmission through the urethra and tissues that line the head of the penis particularly under the foreskin. In their review of 16 different high-quality studies, researchers at the Imperial College and the London School of Hygiene and Tropical Medicine concluded that the per-risk act of HIV through condomless anal sex was roughly around 1.
The Odds of Getting HIV, Ranked
Human immunodeficiency virus HIV attacks and weakens the immune system, making an individual more vulnerable to serious illness. Untreated HIV can lead to AIDS, which occurs when the immune system is so weak it becomes susceptible to serious infections and some cancers. An estimated 39, people in the country were diagnosed with HIV in alone.