The studies that are the basis for the CDC's conclusion were performed almost exclusively in Sub-Saharan Africa, where medical and sanitary resources are far poorer and more limited. Third-world circumstance such as this are a situation in which circumcision does makes sense, as I stated in my original comment. But the CDC's assessment, that the benefits outweigh the risks, has been widely criticized by medical organizations the world over, who point out (as the CDC itself acknowledges) that the effect of circumcision in a third-world country may very well not translate to the first world. Some of the CDC's other data is based simply on the statistic that certain STIs are more common in the Black and Latino communities, which have a smaller circumcised population. This source is particularly dubious, as many doctors have pointed out, since there is a correlation between STI prevalence and relative poverty in general. This rule also applies to Australian Aborigines, as well as certain Muslim immigrant populations in Europe, who have higher rates of both STIs and circumcision. Also, I may not have been especially clear in my original comment; what I meant to say was that studies by religious doctors were the only ones that concluded unequivocally that routine circumcision is beneficial. The CDC more loosely claims that the benefits likely outweigh the risks, and could potentially be used, for example, to mitigate the spread of HIV throughout the general population. They have yet to recommend circumcision as a routine default. Moreover, something to keep in mind is that when measuring what the "risks" of circumcision are, a correctly executed and uncomplicated operation is assumed as the basis, and the CDC is only measuring problems that occur in the absence of a foreskin. They do not take into account the risks that come with the surgery itself. And finally, doctors around the world have criticized the CDC for its conclusion because it entirely neglects to mention that HIV and other such STIs are no more prevalent in Europe and parts of uncircumcised Asia than they are in North America and South Korea, where circumcision is far more common.