<prompt> Most common cause of hemolytic uremic syndrome is -E.coliShigellaSalmonellaPsedononas  <response>: Ans. is a i.e., E.coli Etiology of HUS HUS usually follows an episode of acute gastroenteritis. o Less commonly, patient may present after an upper respiratory tract infection. o The organisms responsible are - E.coli most common EHEC shiga toxin producing Salmonella Shigella dysenteriae Streptococcus pneumoniae Baonella Campylobacter Viruses Coxsackie virus, echovirus, influenza, varicella, HIV, EBV. 