<prompt> A 60 year old female patient complains of diarrhoea and abdominal pain. She was on antibiotic therapy earlier which comprised of Clindamycin. She is a diabetic and is on oral hypoglycemic. Stool culture revealed gram positive motile rods. The colonoscopy is done of this patient and the typical structure is revealed. Which of the following microbe is responsible for this?Clostridium difficileEnteroinvasive E. coliEnteroaggregative E. coliShiga toxin-producing E. coli  <response>: Enteroinvasive E. coli EIEC produce a disease very similar to shigellosis. The disease occurs most commonly in children in developing countries and in travelers to these countries. Similar to Shigella, EIEC strains are nonlactose or late lactose fermenters and are nonmotile. EIEC produce disease by invading intestinal mucosal epithelial cells.Enteroaggregative E. coli EAEC causes acute and chronic diarrhea 14 days in duration in persons in developing countries. These organisms also are the cause of foodborne illnesses in industrialized countries and have been associated with travelers diarrhea and persistent diarrhea in patients with HIV. They are characterized by their specific patterns of adherence to human cells.Shiga toxin-producing E. coli STEC are named for the cytotoxic toxins they produce. STEC has been associated with mild non-bloody diarrhea, hemorrhagic colitis, a severe form of diarrhea, and with hemolytic uremic syndrome, a disease resulting in acute renal failure, microangiopathic hemolytic anemia, and thrombocytopenia.C. difficile can be isolated from stool culture in 30 of patients with antibiotic-associated diarrhoea and over 90 of those with pseudomembranous colitis, but also from 5 of healthy adults and up to 20 of elderly patients in residential care. The rectal appearances at sigmoidoscopy may be characteristic, with erythema, white plaques or an adherent pseudomembrane or may resemble ulcerative colitis. 