Gastrointestinal Gram-Negative Rods and Enterobacteriaceae Quiz

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Questions and Answers

Which of the following statements about Enterobacteriaceae is true?

  • They are relatively hardy but sensitive to drying (correct)
  • They are strict anaerobes
  • They constitute the majority of the total microbial flora of the GI tract
  • They do not contain lipopolysaccharide (LPS)

Which genera of enteric gram-negative rods can cause both gastrointestinal and extra-intestinal diseases?

  • Shigella, Helicobacter, and Vibrio
  • Enterobacter, Klebsiella, Serratia, and Proteus
  • Salmonella, Yersinia, and Campylobacter
  • Escherichia, Salmonella, Yersinia, and Campylobacter (correct)

Which of the following organisms is primarily extra-intestinal in causing diseases?

  • Escherichia coli
  • Enterobacter (correct)
  • Salmonella
  • Shigella

What is the role of fecal contamination in the transmission of organisms causing GI diseases?

<p>It is frequently important in the transmission (B)</p> Signup and view all the answers

Which organism is part of the normal flora of the colon and can be pathogenic both within and outside of the GI tract?

<p>Escherichia coli (A)</p> Signup and view all the answers

Which of the following is a true statement about the Enterobacteriaceae organisms?

<p>They are relatively hardy but sensitive to drying (D)</p> Signup and view all the answers

Which genera of enteric gram-negative rods primarily cause extra-intestinal diseases?

<p>Enterobacter, Klebsiella, Serratia, and Proteus (B)</p> Signup and view all the answers

What is the role of fecal contamination in the transmission of organisms causing GI diseases?

<p>It is important in the transmission of both GI and extra-intestinal diseases (A)</p> Signup and view all the answers

Which of the following organisms is primarily gastrointestinal in causing diseases?

<p>Shigella (B)</p> Signup and view all the answers

What is the habitat of the organisms covered in the lectures?

<p>Gastrointestinal tract, soil, or water (D)</p> Signup and view all the answers

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Study Notes

Enterobacteriaceae

  • The Enterobacteriaceae family includes genera of enteric gram-negative rods that can cause both gastrointestinal and extra-intestinal diseases.
  • The genera of enteric gram-negative rods that can cause both gastrointestinal and extra-intestinal diseases include Escherichia, Klebsiella, Proteus, Enterobacter, and Serratia.

Extra-intestinal Diseases

  • The organism that is primarily extra-intestinal in causing diseases is Klebsiella.
  • The genera of enteric gram-negative rods that primarily cause extra-intestinal diseases include Klebsiella and Serratia.

Transmission of GI Diseases

  • Fecal contamination plays a significant role in the transmission of organisms causing GI diseases.
  • The transmission of organisms causing GI diseases occurs mainly through the fecal-oral route.

Normal Flora and Pathogenicity

  • Escherichia (E. coli) is part of the normal flora of the colon and can be pathogenic both within and outside of the GI tract.

Enterobacteriaceae Organisms

  • Enterobacteriaceae organisms are typically found in the gastrointestinal tract, but can also be found in the environment and in water.
  • Enterobacteriaceae organisms are gram-negative, rod-shaped, and facultative anaerobes.

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