Circumcision study supports HIV theory

Researchers say the foreskin can shelter troublesome bacteria, so its removal may bolster the immune system to keep the AIDS virus at bay.Circumcision is known to reduce a man's risk of HIV infection by at least half, but scientists don't know why. A new study offers support for the theory that removing the foreskin deprives troublesome bacteria of a place to live, leaving the immune system in much better shape to keep the human immunodeficiency virus at bay.

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