Medical Microbiology Lecture 7: Acid Fast Bacteria
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Questions and Answers

What is the initial site of infection for primary tuberculosis?

  • Upper lobe of the lung
  • Lower lobe of the lung (correct)
  • Middle lobe of the lung
  • Entire lung field
  • Which type of tuberculosis is characterized by chronic tissue lesions, the formation of tubercles, caseation, and fibrosis?

  • Latent tuberculosis
  • Postprimary (Secondary) tuberculosis (correct)
  • Reactivation tuberculosis
  • Primary tuberculosis
  • Where does reactivation tuberculosis almost always begin?

  • Middle lobe of the lung
  • Entire lung field
  • Lower lobe of the lung
  • Apex of the lung (correct)
  • What is the duration of protection offered by BCG vaccination?

    <p>15 to 20 years</p> Signup and view all the answers

    Which drug constitutes the first-line drugs in antituberculous therapy?

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

    What is the most familiar species of mycobacteria?

    <p>Mycobacterium tuberculosis</p> Signup and view all the answers

    Which medium is most widely employed for routine culture of Mycobacterium tuberculosis?

    <p>Lowenstein-Jensen (L–J) medium</p> Signup and view all the answers

    What accounts for 60% of the cell wall weight in Mycobacterium tuberculosis?

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

    How do human tubercle bacilli appear on LJ medium?

    <p>Visible growth in 2 weeks</p> Signup and view all the answers

    What is the mode of infection for Mycobacterium tuberculosis?

    <p>Direct inhalation of aerosolized bacilli</p> Signup and view all the answers

    What characteristic sets Mycoplasma apart from other bacteria?

    <p>Lack of a rigid cell wall</p> Signup and view all the answers

    How do Mycoplasmas grow on solid media?

    <p>Embedded beneath the surface</p> Signup and view all the answers

    What type of infections do parasitic mycoplasmas generally produce?

    <p>Respiratory and gastrointestinal infections</p> Signup and view all the answers

    What type of diseases does Mycoplasma cause in humans?

    <p>Pneumonia and urinary tract infections</p> Signup and view all the answers

    What sets Mycoplasma pneumoniae infection apart from other bacterial infections?

    <p>It produces mild upper respiratory tract disease</p> Signup and view all the answers

    What is the most important species responsible for Mycoplasma pneumonia?

    <p>Mycoplasma pneumoniae</p> Signup and view all the answers

    Where is M. hominis typically found in healthy adults?

    <p>Lower genitourinary tract</p> Signup and view all the answers

    What is the incubation period for Mycoplasma pneumonia?

    <p>1–3 weeks</p> Signup and view all the answers

    Which group is most susceptible to Mycoplasma pneumonia infection?

    <p>School age children and young adults</p> Signup and view all the answers

    What is the characteristic of Ureaplasma urealyticum related to urea hydrolysis?

    <p>Production of ammonia</p> Signup and view all the answers

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