Scientific Consensus: Circumcision Prevents AIDS

Where, in that snippet of a quote, is circumcision even mentioned?

You seem more intrigued with the racial breakdown of who contracts it.

There are many factors that affect transmission of the virus, and the only way to prevent transmission with maximum efficacy is not engaging in at-risk sex unless condoms are used, and not sharing needles in the case of drug use. Circumcision may lessen the chance of transmission, but again it is not the only factor.