Microbiology Bacterial Identification Tests
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Questions and Answers

What is the presumptive test for Neisseria?

  • Thayer-Martin Medium
  • Vancomycin
  • Nystatin
  • 1% tetramethyl-p-phenylenediamine dihydrochloride (correct)
  • Which organism is inhibits by vancomycin?

  • Yeast
  • Spreading proteus
  • Gram-positive organisms (correct)
  • Gram-negative rods
  • Which agar is formerly known as Neisseria catharralis or Branhamella catharralis?

  • Thayer-Martin Medium
  • New York City Agar
  • Martin Lewis Agar (correct)
  • Oxidase Test Agar
  • What does a positive oxidase test indicate?

    <p>Dark purple colonies within 10 seconds</p> Signup and view all the answers

    Which test is used to differentiate Neisseria species and Moraxella catharralis?

    <p>Oxidase test</p> Signup and view all the answers

    What is the purpose of Thayer-Martin Medium in microbiology?

    <p>Inhibition of gram-negative rods</p> Signup and view all the answers

    Which organism displays a wagon-wheel appearance on CAP agar?

    <p>Moraxella catharralis</p> Signup and view all the answers

    What is the only organism that is positive on the DNAse test?

    <p>Moraxella catharralis</p> Signup and view all the answers

    Which organism is positive for vigorous bubbling in the Superoxol test?

    <p>N.gonorrhoeae</p> Signup and view all the answers

    Which organisms are negative for reduction of nitrite?

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

    Which organism is exclusively positive for glucose in all the tests conducted?

    <p>N.gonorrhoeae</p> Signup and view all the answers

    Which condition is characterized by recurrent episodes of meningococcemia, petechiae formation, and arthritis?

    <p>Chronic meningococcemia</p> Signup and view all the answers

    What is a distinguishing feature of Neisseria cinerea compared to N. gonorrhoeae?

    <p>Positive for the DNAse test</p> Signup and view all the answers

    In which condition is there severe bleeding in the adrenal glands, leading to a very poor prognosis?

    <p>Friedrichsen Syndrome</p> Signup and view all the answers

    What is the primary function of Endotoxin in the context of meningococcemia?

    <p>Causes the formation of hemorrhagic rash</p> Signup and view all the answers

    Which Neisseria species is considered normal microbiota in the respiratory tract, particularly in the pharynx?

    <p>N. mucosa</p> Signup and view all the answers

    What characteristic feature allows differentiation between N. cinerea and other Neisseria species?

    <p>Positive for Hydroxyprolyl aminopeptidase reaction</p> Signup and view all the answers

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