PCR demonstrated the presence of urease gene in 31, and 16S ribosomal DNA in 58, of the 95 calculi investigated.

• 聚合酶链反应的结果显示在95个受检验的尿石中，31个存有变形杆菌尿素酸素基因，58个含16S核糖去氧核糖核酸。