"bacteria found in circumcised adolescents differed from the bacteria found in the uncircumcised adolescents" In other words, natural boys have natural bacteria and cut boys have different invasive bacteria.

"These differences may be important in understanding why circumcision helps prevent HIV and other sexually transmitted infections in men." There are no real world studies that show cutting off penis parts helps prevent HIV and other sexually transmitted infections in men! In the US no lowering of HIV risk has been noted, and the US has a high circumcised adult population with a high HIV rate and Europe and Japan have a very low number of adults that are circumcised and have a very low HIV rate. There is clear evidence that baby boy penis parts removal does not shield the man the baby becomes from STDs in developed nations.  

This bacteria information is another important example as to how baby boy penis parts removal is harm!  Stop wounding babies.