Microbiology – MCQ 31 – Bacteroides fragilis

Collection of Medicine MCQs (Cardiovascular system) for medical students. Concept based MCQs with detailed explanations which help students to gain valuable insights and gain an edge in competitive examinations. More than just answering MCQs, the explanations will improve the knowledge and understanding about the conditions discussed. Also useful for MD students who are preparing for Superspeciality entrance examinations. Medicine MCQs - Cardiovascular System Kindle Edition: Click Here for a Preview. Comments and suggestions are most welcome.

With reference to Bacteroides fragilis the following statements are true, except:
a) B. fragilis is the same frequent anaerobe isolated from clinical samples.
b) B. fragilis is not uniformly sensitive to metronidazole
c) The lipopolysaccharide formed by B. fragilis is structurally and functionally different from the conventional endotoxin
d) Shock and disseminated intravascular coagulation are common in Bacreriodes bacteremia

Correct answer : d) Shock and disseminated intravascular coagulation are common in Bacreriodes bacteremia

Bacteroides:

  • Gram negative anaerobic bacilli
  • Most common anaerobic pathogen isolated from clinical specimens
  • Virulence factors include capsular polysaccharides and lipopolysaccharide endotoxin
  • Lipopolysaccharide endotoxin is much less toxic compared to other gram negative bacteria
  • Hence infections do not directly produce signs of sepsis, which is common in other gram negative bacteria
  • Some are resistant to metronidazole

 

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