title: Prevention. Microbes may be key to why circumcision reduces HIV risk.
mesh_terms: D001419:Bacteria / Q000302:isolation & purification*; D002944:Circumcision, Male; D015658:HIV Infections / Q000453:epidemiology / Q000517:prevention & control*; D006801:Humans; D008297:Male; D010100:Oxygen / Q000378:metabolism; D040242:Risk Reduction Behavior
chemical_list: D010100:Oxygen