Researchers have found definitive proof of a kidney microbiome that influences renal health and kidney stone formation, demonstrating that the urinary tract is not sterile and low levels of bacteria are normal. They also identified certain bacteria within the microbiome that could promote or block kidney stone development and showed that antibiotic misuse (commonly associated with kidney stone development in a hospital setting) skewed the microbiome towards stone-promoting bacteria. The team's methods showed that bacteria living in the urinary tract were not only there because of disease, since they found them in the urinary tract of people without evidence of...