Mycobacterium tuberculosis MCQ 15+

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• Following are true regarding mycobacteria
  ক

  Rigid cell wall contain mycolic acid

  খ

  M. marinum is photochromogen

  গ

  Capsulated & spore bearing organism

  ঘ

  M. fortuitum is slow grower

  ঙ

  M. avium-intracellular complex is photochromogen
• Myocobacterium tuberculosis is identified by following stains
  ক

  Acid fast stain

  খ

  Zeihl Neelson stain

  গ

  Gram stain

  ঘ

  H & E stain

  ঙ

  PAS stain
• Following statements regarding tuberculosis are true
  ক

  Reactivation may occur in vaccinated person

  খ

  Immunity to tuberculosis may appear in non-vaccinated person

  গ

  Vaccination always prevents primary tuberculosis

  ঘ

  Open-cases are more resistant to anti-tubercular drugs

  ঙ

  Clinical infection provides life long immunity
• M. tuberculosis has the following character
  ক

  Obligate aerobe

  খ

  Cell wall has high lipid content

  গ

  Is a photochromogen

  ঘ

  Do not produce any toxin and enzyme

  ঙ

  Is easily stained by Gram stain
• Humans are the reservoir of following mycobacterium
  ক

  M. bovis

  খ

  M. africanum

  গ

  Mycobacterium avium complex

  ঘ

  M. Kansasii

  ঙ

  M. fortuitum
• The mantoux test
  ক

  Involves injecting PPD intradermally

  খ

  Involves the CD4+ cells

  গ

  Is positive in all patient with tuberculosis

  ঘ

  Is more sensitive than the microscopy

  ঙ

  Becomes positive within 3 weeks of acquiring tuberculosis
• Causes of false negative Mantoux test are
  ক

  Severe tuberculosis

  খ

  Recent infection

  গ

  Newborn baby

  ঘ

  BCG vaccination

  ঙ

  Adrenal tuberculosis
• Positive tuberculin test indicates that the individual
  ক

  Carries viable mycobacterium in some tissues

  খ

  Is at risk of developing disease from reactivation

  গ

  Has been suffering from active disease

  ঘ

  Is immune to tuberculosis

  ঙ

  Is infectious to other persons
• Tuberculosis of the genital tract
  ক

  Commonly involves the fallopian tubes

  খ

  Causes infertility

  গ

  Is associated with ectopic pregnancy

  ঘ

  Commonly involves the cervix

  ঙ

  Is best treated by surgery
• False negative tuberculin test is found in
  ক

  Steroid therapy

  খ

  Recent measles infection

  গ

  HIV infection

  ঘ

  Disseminated tuberculosis

  ঙ

  Infection with non-tubercular mycobacterial infection
• Causes of false negative tuberculin test are
  ক

  Severe malnutrition

  খ

  Prolonged steroid intake

  গ

  Milliary tuberculosis

  ঘ

  tubercular pleural effusion

  ঙ

  Atypical mycobacterial infection
• Regarding Mycobacterium tuberculosis
  ক

  Niacin test is positive

  খ

  Obligate aerobe

  গ

  Cord factor is a virulence factor

  ঘ

  Doubling time is 18 days

  ঙ

  Produce exotoxin
• Latent tuberculosis can be diagnosed by
  ক

  Tuberculin skin test

  খ

  Interferon gamma release assay

  গ

  Microscopic detection of acid fast bacilli

  ঘ

  Culture and sensitivity test

  ঙ

  Serological test