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Microbiology

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Gram Negative Bacilli

Question
13 out of 81
 

Several children are hospitalized with bloody diarrhea and severe hematological abnormalities. A 4-year-old girl dies of kidney failure shortly after admittance. An epidemiological investigation establishes that all of the patients developed symptoms following consumption of hamburgers from the same fast-food restaurant chain. Which of the following organisms is most likely to be responsible for the outbreak? (AIPG 2010)



A Campylobacter jejuni

B Non-O1 serogroup of Vibrio cholerae

C O157:H7 serotype of E. coli

D Shigella dysenteriae

Ans. C O157:H7 serotype of E. coli

O157:H7 serotype of E. coli.

a. Escherichia coli 0157:H7 strains are classically associated with outbreaks of diarrhea after ingestion of undercooked hamburger at fast-food restaurants.

b. Many cases of hemorrhagic colitis and its associated complications can be prevented by thoroughly cooking ground beef.

c. The other organisms listed can cause gastrointestinal disturbances; however, E. coli is the classic disturbing pathogen in this case.

d. Shigella dysenteriae produces a heat-labile enterotoxin that affects the gut and central nervous system and is a human disease that is transmitted via a fecal-oral route.

e. Salmonella and Campylobacter are associated with poultry and eggs primarily, whereas Vibrio is associated mainly with seafood.

Gram Negative Bacilli Flashcard List

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