<prompt> Most common cause of hemolytic uremic syndrome is:E. coliShigellaSalmonellaPseudomonas  <response>: a. E. coliRef: Nelsons 20e p 2508-2510, Ghai 8e p 492-493Etiology of HUS: HUS usually follows an episode of acute gastroenteritis less commonly, upper respiratory infection.The organisms responsible for HUS are:E. coli most common esp EHEC shiga toxin producingSalmonella; Shigella dysenteriaeStreptococcus pneumoniaeBartonella; CampylobacterViruses Coxsackie virus, echovirus, influenza, varicella, HIV, EBV 