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Male circumcision reduces the risk of human immunodeficiency virus (HIV) transmission from HIV+ women to men. In 2020, the World Health Organization (WHO) reiterated that male circumcision is an efficacious intervention for HIV prevention if carried out by medical professionals under safe conditions. The United States Centers for Disease Control and Prevention (CDC) states that circumcision reduces the risk that a man will acquire HIV and other sexually transmitted infections (STIs) from an infected female partner.

Efficacy

Heterosexual men

As of 2020, circumcision is well-established as being effective at reducing the risk of HIV infection in heterosexual men.

The number needed to treat, to prevent one HIV infection during ten years, is between five and fifteen men. The WHO Expert Group on Models To Inform Fast Tracking Voluntary Medical Male Circumcision In HIV Combination Prevention in 2016 found "large benefits" of circumcision in settings with high HIV prevalence and low circumcision prevalence. The Group estimated male circumcision is cost-saving in almost all high priority countries. Furthermore, WHO stated that: "While circumcision reduces a man’s individual lifetime HIV risk, the indirect effect of preventing further HIV transmissions to women, their babies (vertical transmission) and from women to other men has an even greater impact on the population incidence, particularly for circumcisions performed at younger ages (under age 25 years)."

Newly-circumcised HIV infected men who have not had antiretroviral therapy can shed the HIV virus from the circumcision wound, thus increasing the immediate risk of HIV transmission to female partners. This risk of post-operative transmission presents a challenge, although in the long-term it is likely the circumcision of HIV-infected men helps lessen heterosexual HIV transmission overall. Such viral shedding can be mitigated by the use of antiretroviral drugs.

Men who have sex with men

A 2008 meta-analysis of gay and bisexual men (52% circumcised) found that the rate of HIV infection was not lower among men who were circumcised. For men who engaged primarily in insertive anal sex, no effect was observed. Observational studies included in the meta-analysis that were conducted prior to the introduction of highly active antiretroviral therapy in 1996 demonstrated a protective effect for circumcised men who have sex with men (MSM) against HIV infection.

Reviews in 2011 and 2018 found some evidence that circumcision was protective in MSM.

A 2019 meta-analysis of MSM found circumcision was associated with a 42% reduction in the odds of HIV in low and middle income countries, but not in high income countries. The CDC stated in 2018 that there are no data to suggest that circumcision has any effect on HIV risk for men who engage in anal sex with either a female or male partner, as either the insertive or receptive partner.

Recommendations

The most recent WHO review of the totality of evidence confirmed prior estimates of the impact of male circumcision on HIV incidence rates. They again concluded that male circumcision is an efficacious intervention for HIV prevention and that the promotion of male circumcision is an essential strategy, in addition to other preventive measures, for the prevention of heterosexually acquired HIV infection in men.

Kim Dickson, coordinator of the working group that authored a prior report, commented in part that circumcision "would have greatest impact" in countries with relatively high heterosexual HIV transmission rates (greater than 15%) and low circumcision rates (less than 20%). She further commented that circumcision is not full protection and that other methods of HIV prevention are still important in circumcised males.

Although these results demonstrate that male circumcision reduces the risk of men becoming infected with HIV, the UN agencies emphasize that it does not provide complete protection against HIV infection. Circumcised men can still become infected with the virus and, if HIV-positive, can infect their sexual partners. Male circumcision should never replace other known effective prevention methods and should always be considered as part of a comprehensive prevention package, which includes correct and consistent use of male or female condoms, reduction in the number of sexual partners, delaying the onset of sexual relations, and HIV testing and counselling.

— World Health Organization, Joint WHO/UNAIDS Statement.

Because the evidence that circumcision prevents HIV mainly comes from studies conducted in Africa, the Royal Dutch Medical Association (KNMG) has questioned the applicability of those studies to developed countries. Circumcision has not been included in their HIV prevention recommendations. The KNMG policy statement says that the relationship between HIV transmission and circumcision is unclear, and that behavioral factors seem to have more of an effect on HIV prevention than circumcision. The KNMG also recommends that the choice of circumcision should be put off until an age when a possible HIV risk reduction would be relevant, so that boys can decide for themselves whether to undergo the procedure or choose other prevention alternatives. This KNMG circumcision policy statement was endorsed by several Dutch medical associations.

In the United States, the American Academy of Pediatrics (AAP) led a 2012 task force which included the American Academy of Family Physicians (AAFP), the American College of Obstetricians and Gynecologists (ACOG), and the Centers for Disease Control (CDC). The task force concluded that circumcision may be helpful for the prevention of HIV in the United States. In line with the AAP task force, the CDC 2018 position on circumcision and HIV recommended that circumcision should continue to be offered to parents who are informed of the benefits and risks, including a potential reduction in risk of HIV transmission. Circumcision conducted after sexual debut can result in missed opportunities for HIV prevention.

Process

The WHO recommends voluntary medical male circumcision, as opposed to circumcision by traditional healers or untrained individuals. Newly circumcised men must refrain from sexual activity until the wounds are fully healed. Some circumcised men might have a false sense of security that could lead to increased risky sexual behavior.

Mechanism of action

While the biological mechanism of action is not known, a 2020 meta-analysis stated "the consistent protective effect suggests that the reasons for the heterogeneity lie in concomitant individual social and medical factors, such as presence of STIs, rather than a different biological impact of circumcision." The inner foreskin harbours an increased density of CD4 T-cells and releases increased levels of pro-inflammatory cytokines. Hence the sub-preputial space displays a pro-inflammatory environment, conducive to HIV infection.

Experimental evidence supports the theory that Langerhans cells (part of the human immune system) in foreskin may be a source of entry for the HIV virus. Excising the foreskin removes what is thought to be a main entry point for the HIV virus.

History

Valiere Alcena, in a 1986 letter to the New York State Journal of Medicine, noted that low rates of circumcision in parts of Africa had been linked to the high rate of HIV infection. Aaron J. Fink several months later also proposed that circumcision could have a preventive role when the New England Journal of Medicine published his letter, "A possible explanation for heterosexual male infection with AIDS," in October, 1986. By 2000, over 40 epidemiological studies had been conducted to investigate the relationship between circumcision and HIV infection. A meta-analysis conducted by researchers at the London School of Hygiene & Tropical Medicine examined 27 studies of circumcision and HIV in sub-Saharan Africa and concluded that these showed circumcision to be "associated with a significantly reduced risk of HIV infection" that could form part of a useful public health strategy.

A 2005 review of 37 observational studies expressed reservations about the conclusion because of possible confounding factors, since all studies to date had been observational as opposed to randomized controlled trials. The authors stated that three randomized controlled trials then underway in Africa would provide "essential evidence" about the effects of circumcision on preventing HIV.

In 2009, a Cochrane review which included the results of the three 2000s trials found "strong" evidence that the acquisition of HIV by a man during sex with a woman was decreased by 38% and 66% over 24 months if the man was circumcised. The review also found a low incidence of adverse effects from circumcision in the trials reviewed. WHO assessed these as "gold standard" studies and found "strong and consistent" evidence from later studies that confirmed the results. In 2020, a review including post-study follow up from the three randomized controlled trials, as well as newer observational studies, found a 59% reduction in HIV incidence across the three randomized controlled trials, as well as continued protection for up to 6 years after the studies began.

Society and culture

The prevalence of circumcision varies across Africa. Studies were conducted to assess the acceptability of promoting circumcision; in 2007, country consultations and planning to scale up male circumcision programmes took place in Botswana, Eswatini, Kenya, Lesotho, Malawi, Mozambique, Namibia, Rwanda, South Africa, Uganda, Tanzania, Zambia and Zimbabwe.

Programs

In 2011, UNAIDS prioritized 15 high HIV prevalence countries in eastern and southern Africa, with a goal of circumcising 80% of men (20.8 million) by the end of 2016. As of 2020, WHO estimated that 250,000 HIV infections have been averted by the 23 million circumcisions conducted in the 15 priority countries of eastern and southern Africa.

See also

• Reproductive health

References

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3. ^ Farley TM, Samuelson J, Grabowski MK, Ameyan W, Gray RH, Baggaley R (June 2020). "Impact of male circumcision on risk of HIV infection in men in a changing epidemic context - systematic review and meta-analysis". J Int AIDS Soc (Review). 23 (6): e25490. doi:10.1002/jia2.25490. PMC 7303540. PMID 32558344.
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11. "Zoekresultaten". www.knmg.nl. Archived from the original on 2019-05-26. Retrieved 2020-08-17.
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14. Prodger, Jessica L. (September 2017). "The biology of how circumcision reduces HIV susceptibility: broader implications for the prevention field". AIDS Research and Therapy. 14 (1): 49. doi:10.1186/s12981-017-0167-6. PMC 5594533. PMID 28893286.
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