Most common cause of hemolytic uremic syndrome is –

Etiology of HUS HUS usually follows an episode of acute gastroenteritis. Less commonly, patient may present after an upper respiratory tract infection. The organisms responsible are - E.coli (most common) → EHEC (shiga toxin producing)            Shigella dysenteriae      Salmonella      Bartonella    Streptococcus pneumonia       Campylobacter