Question 问题：

What is the most common cause of infectious bloody diarrhea in the United States? What is the treatment? 

美国最常见的感染性血性腹泻的原因是什么？如何治疗？

Answer 答案：

Shiga toxin-producing E.coli. Antibiotics are not recommended for toxin-producing bacteria, especially STEC, due to risk of hemolytic uremic syndrome and bacterial lysis leading to worsening illness or symptom prolongation. 

产志贺毒素大肠杆菌（STEC）。由于出现溶血性尿毒症症状风险和导致疾病恶化或症状延长，不建议对产毒素细菌使用抗生素，尤其是STEC。

参考文献：

Mayo Clin Proc.2021;96:E1