Yeah that study is different because it involves transmission from men to women instead. The circumcision study in regard to men having reduced risk themselves never said it prevented HIV infection absolutely, just that it can reduce it, but that men still need to wear protection to protect themselves regardless if they are circumcised.
Also, the circumcision study was only regard to African men, i.e. blacks right? A large proportion of African people have an increased genetic vulnerability to HIV."The findings were published in the July 17 issue of Cell Host & Microbe.
The researchers found that a genetic trait -- found in 60 percent of African-Americans and 90 percent of Africans -- makes HIV infection 40 percent more likely. The trait is virtually nonexistent in whites."http://health.usnews.com/articles/health/healthday/2008/07/16/genetic-trait-boosts-aids-risks-in-blacks.html
Would be interesting to see how circumcision would affect transmission in only white people.
Has there ever been a study to see if circumcision of women reduces the transmission of certain stds including hiv? Less skin folds means less surface area and perhaps protection by keratinization as well.
Circumcision should never be forced on anyone though, i.e. children, male or female. It should be a person's choice to have done or not when they are old enough to make such a decision for themselves.