Is this natural selection?
Although gays form just 4% of the US population, they account for 63% of all the new HIV infections. Almost 90% of all the new cases are linked to gay / bisexual men, as more than 80% of the women newly identified with HIV were also infected by bisexual men.
http://www.cdc.gov/hiv/pdf/statistics_basics_factsheet.pdfSo far in the United States, some 311,087 gays have died due to the HIV infection, since the first case was diagnosed in the 1980s. Out of the ~1,200,000 people currently living with HIV in the United States, some 624,000 are gay.
This means that a total of 935,000 HIV infections have occurred among the gays ever since 1980s, out of a total population of 12 million. That represents an
incidence rate of 7.8% against the general prevalence rate of 0.4% and a prevalence of <0.1% among heterosexual men.
Well the stats don't lie
It would explain why blood banks restricted blood transfusions from gay individuals and also the question on that topic referring to the last time they had sex with someone seeing that it takes time for HIV and those type of diseases to emerge.
What is FDA's policy on blood donations from men who have sex with other men?
Men who have had sex with other men (MSM), at any time since 1977 (the beginning of the AIDS epidemic in the United States) are currently deferred as blood donors. This is because MSM are, as a group, at increased risk for HIV, hepatitis B and certain other infections that can be transmitted by transfusion.
Why doesn't FDA allow men who have had sex with men to donate blood?
FDA's primary responsibility with regard to blood and blood products is to assure the safety of patients who receive these life-saving products. FDA uses multiple layers of safeguards in its approach to ensuring blood safety, which include donor screening and deferral based on risk factors, blood testing for markers of infection, inventory controls, and deferral registries. The use of these multiple layers helps to assure the safety of the products in the event that one layer fails.
A history of male-to-male sex is associated with an increased risk for exposure to and transmission of certain infectious diseases, including HIV, the virus that causes AIDS. Men who have had sex with other men represent approximately 2% of the US population, yet are the population most severely affected by HIV. In 2010, MSM accounted for at least 61% of all new HIV infections in the U.S. and an estimated 77% of diagnosed HIV infections among males were attributed to male-to-male sexual contact. Between 2008 and 2010, the estimated overall incidence of HIV was stable in the U.S. However the incidence in MSM increased 12%, while it decreased in other populations. The largest increase was a 22% increase in MSM aged 13 to 24 years. Since younger individuals are more likely to donate blood, the implications of this increase in incidence need to be further evaluated.
Is FDA's policy of excluding MSM blood donors discriminatory?
FDA's deferral policy is based on the documented increased risk of certain transfusion transmissible infections, such as HIV, associated with male-to-male sex and is not based on any judgment concerning the donor's sexual orientation.
Why are some people, such as heterosexuals with multiple partners, allowed to donate blood despite increased risk for transmitting HIV and hepatitis?
Current scientific data from the U.S. Centers for Disease Control and Prevention (CDC) indicate that, as a group, men who have sex with other men are at a higher risk for transmitting infectious diseases or HIV than are individuals in other risk categories. From 2007 through 2010, among adult and adolescent males, the annual number of diagnosed HIV infections attributed to MSM increased, while the numbers of infections attributed to other risks among males decreased. Among adult and adolescent females, the annual number of diagnosed HIV infections attributed to injection drug use and heterosexual contact both decreased.
http://www.fda.gov/BiologicsBloodVaccines/BloodBloodProducts/QuestionsaboutBlood/ucm108186.htmGood old FDA providing stats since the 1970s