In the midst of an international campaign to slow the spread of HIV in sub-Saharan Africa, the World Health Organisation recommends male circumcision (the surgical removal of foreskin from the penis) which reduces HIV acquisition by 50-60%. However, scientists report that a new study of HIV-infected men in Uganda has identified a temporary, but potentially troublesome unintended consequence of the procedure: a possible increased risk of infecting female sexual partners while circumcision wounds heal.
In a study by researchers from the Johns Hopkins University School of Medicine, the Johns Hopkins University Bloomberg School of Public Health and Rakai Health Sciences Programme, 223 HIV-positive Ugandan men were medically circumcised. Health workers poured 5ml (about a teaspoon) of saline solution over the circumcision site near the neck of the penis and collected the solution for testing just before surgery, during the operation, and once a week for 12 weeks.
Data showed that among the 183 men not taking antiretroviral drugs, less than 10% were shedding HIV before circumcision, but nearly 30% were shedding the virus two weeks after surgery. The percentages dropped sharply as the men’s wounds healed, to less than 3% at six weeks and less than 2% at 12 weeks.
Circumcision reduced the number of HIV-positive men who were shedding the virus more than five-fold over the long term, but it had the opposite effect in the weeks right after the surgery. "There is a window of a few weeks after circumcision when the risk that an HIV-infected man could transmit the virus to a female partner actually increases," says Dr Aaron AR Tobian, an associate professor of pathology at the Johns Hopkins University School of Medicine and the study's first author. "During that time, more HIV-infected men are shedding the virus, and on average they are shedding greater amounts of it, than before circumcision," he adds.
"We don't know for certain if this increase in the amount of virus the men are shedding actually leads to more cases of HIV transmission to their female partners," says co-author Dr Ronald Gray, a professor of epidemiology at the Bloomberg School. "But we do know that HIV-infected men who engage in sex before their circumcision wound heals have higher rates of transmission to their partners. Also, the higher an HIV-infected person’s viral load, the greater the risk of transmitting the virus to a partner. So it is plausible that the risk goes up during that time." A report on the study cites two factors – the passage of time, and treatment with anti-retroviral drugs – that dramatically reduced the virus’ prevalence in HIV-positive, recently circumcised men.
Case by case, the likelihood of HIV transmission from a newly-circumcised man to his female partner is less than one-tenth of 1%, the researchers estimated. But with the World Health Organisation seeking to circumcise nearly 29m men, the study projects that this small increase could add up to 17,000 new infections among female partners of newly circumcised HIV-infected men.
Medical circumcision has been shown to cut the odds of contracting HIV by 50-60% in adult men; greatly reduce cases of genital herpes and human papillomavirus; and reduce the prevalence of some sexually transmitted infections in female partners. The World Health Organisation has set a goal of circumcising about four out of five men aged 15 to 49 in southern and eastern Africa. Adolescent and adult circumcision programmes are ongoing, and include HIV testing and counselling. Studies show about 6% of the men seeking circumcision are HIV-positive.
"All male circumcision programs are counselling men to abstain from sex while their wounds are healing," says co-author Dr Godfrey Kigozi at the Rakai Health Sciences Programme. "But several programmes have reported that greater than 30% of the men have sex with female partners during the healing period."
"Although we're counselling men not to have sexual intercourse while their wounds are healing, we know that they are," Tobian says, "and it's important to take steps to reduce the risk that they’ll transmit the virus to their female partners during this time."
The solution, he says, may lie in another one of the study's findings. "If the men are on antiretroviral drugs, this reduces the risk of their shedding the virus by about 90%," Tobian says. "Thus, it is logical for HIV-infected men to begin anti-retroviral therapy at the time of circumcision. However, we will need further studies to find out exactly which drugs and for how long."
[link url="http://www.hopkinsmedicine.org/news/media/releases/as_circumcision_wounds_heal_hiv_positive_men_may_spread_virus_to_female_partners_study_shows"]Johns Hopkins Medicine material[/link]
[link url="http://journals.plos.org/plosmedicine/article?id=10.1371/journal.pmed.1001820"]PLOS Medicine abstract[/link]