Male Circumcision May Halve HIV Risk
2 African Studies on Adult Male Circumcision Show Promising Results
Dec. 14, 2006 -- Male circumcision may cut a man's
risk of contracting HIV in half, according to two new studies.
The preliminary finding is based on two studies of men living in the African
nations of Kenya and Uganda, in areas where heterosexual transmission of the
virus is common.
Because of the promising results, the studies were halted early to give all
participants the option of getting circumcised.
"Circumcision is now a proven, effective prevention strategy to reduce
HIV infections in men," says Robert Bailey, PhD, in a University of Chicago
Bailey, a University of Chicago epidemiology professor, worked on one of the
However, he cautions, "Circumcision cannot be a stand-alone
intervention" against HIV transmission.
"It has to be integrated with all the other things that we do to prevent
new HIV infections, such as treating sexually transmitted diseases and
providing condoms and behavioral counseling," Bailey says.
Adult Male Circumcision Studies
One study included nearly 5,000 men in Rakai, Uganda; the other almost 2,800
men in Kisumu, Kenya. Both were funded by the U.S. National Institute of
Allergy and Infectious Diseases (NIAID).
None of the study participants had been circumcised before the studies
The Ugandan men were 15 to 49 years old; the Kenyan men 18 to 24. They were
randomly assigned to get circumcision (surgical removal of the foreskin) right
away or after a two-year delay.
Trained medical staff performed the circumcisions in an operating room under
local anesthesia and provided follow-up care as the men healed from the
Male Circumcision Halved HIV Risk
Both studies enrolled participants by September 2005 and were scheduled to
last until the middle of 2007.
That plan changed on Dec. 12, 2006, when researchers reviewed the studies'
interim results, which showed that the men who had gotten circumcised were
about half as likely to contract HIV.
In the Ugandan study, the circumcised men were 48% less likely to acquire
HIV. In the Kenyan study, they were 53% less likely.
Based on those results, the trials were stopped early so any participant who
wanted to could get circumcised.
Circumcision has recognized risks, including infection and blood loss.
That's why appropriate medical care is necessary, Bailey says.
"Already, there are large numbers of boys and young men who are seeking
circumcision in areas of Africa where men are not traditionally
circumcised," Bailey says.
"The danger is that unqualified practitioners will fill a niche by
providing circumcision, but with much higher complication rates," he
No serious complications were seen in these two studies, but about 2% of the
surgeries resulted in mild complications, such as bleeding or infection,
according to the University of Chicago.
Implications for U.S.
The African studies "will likely not have a large impact on the
incidence of HIV/AIDS in the United
States or Europe, where heterosexual transmission is low compared with areas
like sub-Saharan Africa and parts of Asia," Bailey says.
The CDC hasn't made any recommendations on male circumcision to reduce HIV
transmission and is studying risks and benefits of circumcision as an HIV
prevention strategy here.
Most U.S. men -- about 77% -- report having been circumcised, according to
The procedure is less common in many parts of Africa and elsewhere in the