Chat with AIExam 22: Infections of the Digestive System
Which of the following organisms is the most appropriate match for traveler's diarrhea?
(77) 
VerifiedB
Compare the pathogenesis of enterotoxigenic Escherichia coli (ETEC),enteropathogenic
E. coli (EHEC).
E. coli (EPEC), and enterohemorrhagic
(84) VerifiedThe pathogenesis of enterotoxigenic E.coli (ETEC)involves the adherence of pathogens to the intestinal epithelium and the secretion of enterotoxins (heat-labile or heat-stable)that cause water and electrolytes to flow into the lumen of the intestine and produce watery diarrhea.The pathogenesis of enteropathogenic E.coli (EPEC)involves colonization of the intestinal epithelia using fimbriae.Attachment results in lesions that cause effacement of the microvilli of the intestinal cells and morphological changes to the cells.At least five different proteins that interfere with signal transduction and cytoskeletal architecture are secreted directly into the cytosol of host target cells,leading to watery diarrhea.The pathogenesis of enterohemorrhagic E.coli (EHEC)involves the production of Shiga toxin and intestinal microvilli effacement.EHEC attack the colon using attachment proteins and the secretion injection system to deliver proteins into target cells,altering the cytoskeletal components of the cells.Attachment and effacement cause diarrhea,while the Shiga toxin produces capillary thrombosis and inflammation of the colonic mucosa,leading to hemorrhagic colitis,and can also lead to renal failure.
Which of the following organisms is the most appropriate match for endemic gastrointestinal infection in developed countries?
(61) VerifiedD
Answer true or false to the reason given in the following statement: Tooth destruction occurs because of the organic acids produced as a part of the metabolic activity of bacteria.
(78) Answer true or false to the reason given in the following statement: Enterohemorrhagic
E. coli are so named because they involve the production of heat-labile toxin.
(79) Bloody diarrhea is characteristic of _____ infections,whereas mucoid watery diarrhea is seen with _____ infections.
(85) Which of the following is a mismatched pair with respect to dental and periodontal infections?
(86) Which of the following is not a characteristic of typhoid fever?
(78) A(n)_____ is a thin layer of salivary proteins and glycoproteins that binds to the surface of teeth.
(66) Which of the following organisms is the most appropriate match for typhoid fever?
(81) All of the following are characteristic of a rotavirus infection except
(71) What is the most likely mode of transmission for Campylobacter jejuni?
(70) Answer true or false to the reason given in the following statement: Food poisoning intoxication can occur more rapidly than infection because in the former the toxin is already present in the ingested food.
(83) 
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