Introduction: Hyperoxaluria is the main factor leading to the development of nephrolithiasis. Hyperoxaluria in children can be asymptomatic for a long time, leading to secondary oxalate nephropathy, to urolithiasis and chronic kidney disease. The vast majority of kidney stones are calcium oxalate. Limiting the intake of products containing oxalic acid is not the main way to prevent calcium oxalate microlites. In this regard, scientists were interested in the bacterium Oxalobacter formigenes, which exhibits a symbiotic relationship with the human body by reducing the absorption of oxalates in the intestinal lumen with a further decrease in their concentration in plasma and urine. Oxalobacter formigenes is currently the most effective intestinal absorbent microbial oxalate.
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