Mycobacterium Tuberculosis and Host Response Quiz
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Questions and Answers

Which type of immune response is activated by tuberculin and mycolic acid?

  • Cell-mediated immunity (correct)
  • Autoimmune response
  • Humoral immunity
  • Innate immunity

What is the role of sulfatides in Mycobacterium tuberculosis?

  • Promote exotoxin production
  • Contribute to delayed hypersensitivity (correct)
  • Inhibit phagosome-lysosome fusion
  • Mediate granulomas and caseation

What is the classic example of delayed type IV hypersensitivity?

  • Mantoux tuberculin test (correct)
  • PCR test for tuberculosis
  • Western blot test for tuberculosis
  • ELISA test for tuberculosis

Which cytokines must be produced by macrophages to effectively control Mycobacterium tuberculosis?

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

Which cells are at great risk of reactivating Mycobacterium tuberculosis if patients receive anti-TNFα monoclonal antibodies?

<p>Effector Th1 cells (D)</p> Signup and view all the answers

What is the main effect of hypoxic conditions on infiltrating macrophages in Mycobacterium tuberculosis infection?

<p>Adoption of M2 phenotype (D)</p> Signup and view all the answers

Which type of immune response involves activation of phagocytes, natural killer cells, and antigen-specific T-lymphocytes?

<p>Cell-mediated immunity (B)</p> Signup and view all the answers

What is the most important characteristic of Mycobacterium tuberculosis that allows its intracellular survival?

<p>Inhibition of phagosome-lysosome fusion (A)</p> Signup and view all the answers

Which response correlates with the increased risk of Mycobacterium tuberculosis infection?

<p>Production of IL-4 or IL-10 (C)</p> Signup and view all the answers

Which antibodies are not involved in the immune response against Mycobacterium tuberculosis?

<p>IgE antibodies (A)</p> Signup and view all the answers

What is the primary function of autophagosomes?

<p>To target cellular contents for degradation in lysosomes (A)</p> Signup and view all the answers

What is the outcome of fusion of Mtb-laden phagosome with an autophagosome?

<p>Creation of a microbicidal compartment for eliminating Mtb (A)</p> Signup and view all the answers

What happens if the environment inside the lysosomal fusion acidifies?

<p>Formation of a microbicidal compartment for eliminating Mtb (A)</p> Signup and view all the answers

What is the role of virulent Mtb in the host cell?

<p>To actively inhibit phagolysosomal maturation and acidification (A)</p> Signup and view all the answers

What is the consequence of cell death during Mtb infection?

<p>Release of viable microbes leading to infection spread (A)</p> Signup and view all the answers

What can lead to mycobacterial replication and disease symptoms later in life?

<p>Erosion of granulomas into airways under conditions of reduced T-cell immunity (B)</p> Signup and view all the answers

What is the potential outcome of reactivational TB?

<p>Miliary TB affecting various organs such as kidneys, GI tract, brain, and spine (D)</p> Signup and view all the answers

What are the symptoms associated with primary pulmonary TB?

<p>Fever, dry cough (B)</p> Signup and view all the answers

What occurs if organisms remain viable within the Ghon complex?

<p>Most people heal without disease (C)</p> Signup and view all the answers

What is a potential consequence of erosion of granulomas into airways later in life?

<p>Mycobacterial replication under conditions of reduced T-cell immunity (D)</p> Signup and view all the answers

What is the classic example of delayed type IV hypersensitivity?

<p>Intradermal tuberculin test (C)</p> Signup and view all the answers

Which cells are at great risk of reactivating Mycobacterium tuberculosis if patients receive anti-TNFα monoclonal antibodies?

<p>Macrophages (C)</p> Signup and view all the answers

What occurs if organisms remain viable within the Ghon complex?

<p>Progression into active disease (B)</p> Signup and view all the answers

What is the role of sulfatides in Mycobacterium tuberculosis?

<p>Inhibiting phagosome-lysosome fusion (A)</p> Signup and view all the answers

What is the main effect of hypoxic conditions on infiltrating macrophages in Mycobacterium tuberculosis infection?

<p>Shift towards M1 phenotype (B)</p> Signup and view all the answers

What is the potential outcome of reactivational TB?

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

Which cytokines must be produced by macrophages to effectively control Mycobacterium tuberculosis?

<p>IFNγ and TNFα (A)</p> Signup and view all the answers

What is the primary function of autophagosomes?

<p>Degradation of cellular components (B)</p> Signup and view all the answers

Which type of immune response involves activation of phagocytes, natural killer cells, and antigen-specific T-lymphocytes?

<p>Cell-mediated immunity (B)</p> Signup and view all the answers

What is the consequence of cell death during Mtb infection?

<p>Inflammation and tissue damage (B)</p> Signup and view all the answers

What is the primary function of autophagosomes?

<p>Recycling cellular contents during starvation (A)</p> Signup and view all the answers

What occurs if organisms remain viable within the Ghon complex?

<p>The organisms can survive unless treated (A)</p> Signup and view all the answers

What is the main effect of hypoxic conditions on infiltrating macrophages in Mycobacterium tuberculosis infection?

<p>Reduced ability to set up cell mediated immunity (B)</p> Signup and view all the answers

Which type of immune response is activated by tuberculin and mycolic acid?

<p>Cell-mediated immune response (A)</p> Signup and view all the answers

What is the role of sulfatides in Mycobacterium tuberculosis?

<p>Inhibiting phagolysosomal maturation (B)</p> Signup and view all the answers

What happens if the environment inside the lysosomal fusion acidifies?

<p>Elimination of Mtb through lysosomal fusion (D)</p> Signup and view all the answers

What is a potential consequence of erosion of granulomas into airways later in life?

<p>Increased risk of infecting any organ system (A)</p> Signup and view all the answers

What is the consequence of cell death during Mtb infection?

<p>Release of viable microbes and spread of infection (A)</p> Signup and view all the answers

What is the most important characteristic of Mycobacterium tuberculosis that allows its intracellular survival?

<p>Expression of factors that actively inhibit phagolysosomal maturation and acidification. (A)</p> Signup and view all the answers

Which cytokines must be produced by macrophages to effectively control Mycobacterium tuberculosis?

<p>Interleukin-12 and Interferon-gamma (IFN-γ) (B)</p> Signup and view all the answers

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