Indeed, it would have been nice to know what percentage of the "half of whom did not have cancer" had this bacteria in their stool samples. But they do imply l

Indeed, it would have been nice to know what percentage of the "half of whom did not have cancer" had this bacteria in their stool samples. But they do imply later that the number should be low by stating "The bacteria is usually only found in the mouth, far from the colon."