<prompt> All are true about enterohemorrhagic E.coli Except?Sereny test positiveMay cause diarrhoeaCan cause hemolytic uremic syndromeVerocytotoxin is produced  <response>: Ans. is a i.e., Sereny test positive . Sereny test is positive in Enteroinvasive E. coli EIEC not in Enterohemorrhagic E. coli EHEC. . EHEC can cause :- i Severe diarrhea ii Hemorrhagic colitis iii Hemolytic uremic syndrome . It produces verocytotoxin VT or shiga like toxin SLT. Sereny test . Sereny test is done for EIEC and shigella. . In this test, instillation of a suspension of freshly isolated ETEC or shigella into the eyes of guinea pigs leads to mucopurulent conjuctivitis and severe keratitis. 