Oxalobacter formigenes
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Oxalobacter formigenes is an oxalate-degrading anaerobic bacterium which colonizes the large intestine in humans. While the human colon is normally cultivated by these bacteria, they can be lost due to antibiotic treatment with quinolones (though not penicillin or Bactrim). In people lacking the bacterium, calcium oxalate is not degraded in the intestinal tract and kidney stones can recur.[1] Research is being conducted on its use as a treatment to prevent the formation of calcium-oxalate kidney stones.