Medical Bacteriology II: Gram Negative Bacteria
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Questions and Answers

Which of the following bacteria is a Gram-negative cocci?

  • Proteus mirabilis
  • Salmonella typhimurium
  • Escherichia coli
  • Neisseria meningitidis (correct)

    • Which family do Enterobacteriaceae bacteria belong to?

  • Gram-negative cocci
  • Anaerobic Gram-negative bacteria
  • Spirochetes
  • Gram-negative rods (correct)

    • Which of the following bacteria reduces nitrates to nitrites?

  • Moraxella catarrhalis
  • Klebsiella pneumoniae (correct)
  • Shigella dysenteriae
  • Neisseria gonorrhoeae

    • Which one of the following bacteria resides in the gastrointestinal tract of animals and humans?

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

    Which bacteria is commonly associated with causing meningococcal disease?

    <p>Neisseria meningitidis</p> Signup and view all the answers

    Which of the following bacteria is a Spirochete?

    <p>Treponema pallidum</p> Signup and view all the answers

    Which antigen is associated with the flagellar antigen of motile cells only?

    <p>H antigen</p> Signup and view all the answers

    What is the identifying feature of Escherichia coli strains on MacConkey agar?

    <p>Pink colonies</p> Signup and view all the answers

    Which test is used to identify the presence of urease enzyme in bacterial species?

    <p>Urease Test</p> Signup and view all the answers

    In capsulated strains of Klebsiella, which antigen is masked by the K antigens?

    <p>O antigen</p> Signup and view all the answers

    What is a common source of transmission for enterohemorrhagic strains of Escherichia coli?

    <p>Contaminated crops with human fecal fertilizer</p> Signup and view all the answers

    Which genus possesses five O antigens, with O antigens being identifiable only in non-capsulated mutants?

    <p>Klebsiella</p> Signup and view all the answers

    What is the distinguishing feature of klebsiella bacteria?

    <p>Large polysaccharide capsule</p> Signup and view all the answers

    What is the main disease caused by Klebsiella pneumoniae in community-acquired settings most often affecting older men with chronic lung disease, alcoholism, or diabetes?

    <p>Pneumonia</p> Signup and view all the answers

    Which antibiotic is commonly used for treating Klebsiella pneumoniae infections, particularly those caused by ESBL-producing strains?

    <p>Carbapenem</p> Signup and view all the answers

    What is the primary method of transmission for Shigella bacteria?

    <p>Ingestion of contaminated food or water</p> Signup and view all the answers

    Klebsiella pneumoniae is a motile bacterium

    <p>False</p> Signup and view all the answers

    Shigella bacteria are Gram-negative rods

    <p>True</p> Signup and view all the answers

    Salmonella capsular antigen is also known as the O antigen

    <p>False</p> Signup and view all the answers

    Escherichia coli strains are identified by their O, H, and K antigen serotypes

    <p>True</p> Signup and view all the answers

    Klebsiella pneumoniae is a spore-forming bacterium

    <p>False</p> Signup and view all the answers

    Klebsiella pneumoniae is oxidase positive

    <p>False</p> Signup and view all the answers

    Escherichia coli ferments lactose

    <p>True</p> Signup and view all the answers

    Shigella flexneri is a Gram-positive bacterium

    <p>False</p> Signup and view all the answers

    Salmonella is part of the Enterobacteriaceae family

    <p>True</p> Signup and view all the answers

    Shigella bacteria are commonly associated with causing urinary tract infections

    <p>False</p> Signup and view all the answers

    Neisseria gonorrhoeae is a Gram-positive bacterium.

    <p>False</p> Signup and view all the answers

    Salmonella enteritidis is a member of the Enterobacteriaceae family.

    <p>True</p> Signup and view all the answers

    Yersinia pestis is a facultative anaerobe.

    <p>True</p> Signup and view all the answers

    Proteus mirabilis is a member of the Non-Enterobacteriaceae Bacteria.

    <p>False</p> Signup and view all the answers

    Neisseria meningitidis is a Spirochete.

    <p>False</p> Signup and view all the answers

    Escherichia coli is cytochrome C oxidase positive.

    <p>False</p> Signup and view all the answers

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