A study by the National Institutes of Health has confirmed that circumcision reduces a man's risk of acquiring HIV from heterosexual intercourse by 50%, the New York Times reports. The NIH trials conducted in Kenya and Uganda reproduced the findings of a similar study done in South Africa one year ago. Scientists believe that uncircumcised men are more susceptible to contracting HIV because Langerhans cells found in men's foreskins easily attach to the virus. HIV positive circumcised men are also 30% less likely than uncircumcised men to transmit the virus to their female partners. A New England Journal of Medicine study published in 2002 also discovered that uncircumcised men were three times as likely to be carriers of the human papillomavirus as circumcised men. The papillomavirus has been linked to cervical cancer in infected women.
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