Diarrhea Quiz

Which of the following organisms causes non-inflammatory diarrhea?

• Shigella

• Enteroinvasive E. coli

• Vibrio cholerae

• Campylobacter jejuni

A child in a daycare center develops watery diarrhea without blood or fever. The most likely pathogen is:

• Salmonella typhi

• Rotavirus

• EHEC

• Shigella

Which of the following organisms shows “shooting star” motility under dark field microscopy?

• E. coli

• Vibrio cholerae

• Shigella

• Yersinia enterocolitica

Verotoxin is produced by which of the following E. coli types?

• ETEC

• EHEC

• EIEC

• EAEC

A major complication of EHEC infection is:

• Typhoid fever

• Pseudomembranous colitis

• Hemolytic uremic syndrome

• Guillain-Barré syndrome

Which of the following pathogens is transmitted through raw shellfish?

• Norovirus

• Vibrio parahaemolyticus

• Shigella

• Clostridium difficile

Shigella causes dysentery by:

• Producing heat-labile toxin

• Stimulating cAMP

• Inhibiting protein synthesis via 60S ribosome

• Invasion of Peyer’s patches

Which of the following laboratory findings is typical of inflammatory diarrhea?

• Watery stool with no PMNs

• Rice-water stool

• Stool positive for leukocytes and blood

• No fever, clear stool

Norovirus is most likely to affect which group?

• Infants under 1 year

• Daycare toddlers

• School-aged children and adults

• Elderly in ICU

Which bacterial cause of diarrhea is part of normal gut flora and becomes pathogenic after antibiotic use?

• EHEC

• Campylobacter

• Clostridium difficile

• Vibrio cholerae