Escherichia coli caused 80% of cases of acute pyelonephritis in women and 70% of cases in men and was less dominant in older age groups.

• 女性患者中80%25病例由大肠杆菌引起急性肾盂肾炎，男性患者中70%25病例由大肠杆菌引起急性肾盂肾炎，老年人组的这项比例更小。