Microbiology Questions And Answers

41⟩ Which of the following is the metabolically active form of Chlamydia trachomatis?

* A. Elementary body

* B. Jolley body

* C. Extracellular body

* D. Reticulate body

* E. None of the above

Correct Answer: D

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42⟩ Which of the following pathogens is unlikely to be a cause of nongonococcal urethritis?

* A. Ureaplasma urealyticum

* B. Chlamydia trachomatis

* C. Mycoplasma hominis

* D. Mycoplasma genitalium

* E. Chlamydia pneumoniae

Correct Answer: E

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43⟩ Which of the following statements concerning Chlamydia trachomatis infections is NOT correct?

* A. Serology is the diagnostic test of choice in the diagnosis of acute infection.

* B. 50% of infants born to infected mothers during labor develop infections.

* C. Tetracycline's are useful for treatment of C. trachomatis infections.

* D. The clinical spectrum of C. trachomatis sexually transmitted diseases is similar to N. gonorrhoea

* E. e. Endemic trachoma is a major cause of blindness worldwide.

Correct Answer: A

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44⟩ A 24-year-old pigeon fancier presents with fever to 40 degrees C, severe, diffuse headache, malaise, dry hacking cough and muscle aches. Lung exam reveals bilateral crackles and there is hepatosplenomegaly. The most likely pathogen causing this mans infection is?

* A. Mycoplasma pneumoniae

* B. Chlamydia pneumoniae

* C. Chlamydia psittaci

* D. Franciscella tularensis

* E. Legionella pneumophila

Correct Answer: C

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45⟩ Which of the following statements regarding mycoplasmas is NOT correct?

* A. Mycoplasmas are the smallest free-living micro-organisms.

* B. Mycoplasmas are resistant to cell wall active antibiotics.

* C. Mycoplasmas are common commensals of the respiratory and urogenital tracts.

* D. Mycoplasmas stain well with the Gram's stain.

* E. Mycoplasmas grow slowly on enriched media.

Correct Answer: D

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46⟩ Which of the following is the most common clinical syndrome associated with Mycoplasma pneumoniae?

* A. Hemolytic anemia

* B. Lobar pneumonia

* C. Tracheobronchitis

* D. Bullous myringitis

* E. Percarditis

Correct Answer: C

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47⟩ Which of the following pathogens causes invasive joint disease in immuno-compromised hosts?

* A. Mycoplasma pneumoniae

* B. Mycoplasma hominis

* C. Ureaplasma urealyticum

* D. Chlamydia pneumoniae

* E. None of the above

Correct Answer: B

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48⟩ Which of the following are characteristics that are shared by Mycoplasma hominis and Ureaplasma urealyticum?

* A. Both cause post-partum fever.

* B. Ampicillin would be a reasonable choice for treatment.

* C. Both organisms are identified by production of urease.

* D. Both stimulate production of cold agglutinins.

* E. Both organisms grow well on sheep blood agar.

Correct Answer: A

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49⟩ A 4-year-old child comes to the emergency room with a sore throat, difficulty swallowing, and difficulty breathing. On exam there is obvious difficulty each time the child tries to take in a breath with sounds suggesting obstruction. A lateral neck x-ray shows a swollen epiglottis. The organism most likely to cause this syndrome is?

* A. Neisseria meningitidis

* B. Group A streptococcus

* C. Haemophilus influenzae

* D. Candida albicans

Correct Answer: C

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50⟩ The major virulence factor of Haemophilus influenzae type b is?

* A. Its surface pili

* B. Its surface polysaccharides

* C. Its cell wall

* D. Its cell membrane

Correct Answer: B

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51⟩ Important in the laboratory detection of Haemophilus influenzae is that it is?

* A. Beta hemolytic on sheep blood agar

* B. Catalase positive

* C. Anaerobic

* D. Fastidious

Correct Answer: D

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52⟩ A common characteristic of Capnocytophaga, Moraxella, and Eikenella is that they?

* A. Are anaerobic

* B. Are they part of the normal flora of the upper respiratory tract?

* C. Cause urinary tract infections

* D. Are they gram positive?

Correct Answer: B

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53⟩ A common characteristic of Legionella species is that they?

* A. Are gram positive rods

* B. Are acid fast

* C. Require supplemental ingredients to grow them in laboratory media

* D. Are extracellular pathogens

Correct Answer: C

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54⟩ Most humans become infected with legionella by?

* A. A water source

* B. By tick exposure

* C. By mosquito exposure

* D. By direct contact with another person who is infected

Correct Answer: A

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55⟩ Legionella infection is more common in patients who?

* A. Are smokers with COPD

* B. Are diabetics

* C. Are premature infants

* D. Are patients on broad spectrum antibiotics?

Correct Answer: A

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56⟩ A 30-year-old patient comes to clinic complaining of a three-week history of cough. He started with a runny nose, fever and sneezing for a few days followed by a dramatic cough that keeps him up at night. He complains of episodes of coughing where he will have fits of coughing with 10-15 coughs during one exhalation to the point that he is afraid that he will never be able to take in a breath. These coughing episodes are so severe that his ribs are extremely sore. An organism you should consider would be?

* A. Staph aureus

* B. Tuberculosis

* C. Bordetella pertussis

* D. Haemophilus influenzae

Correct Answer: C

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57⟩ An important characteristic of mycobacteria is that they are?

* A. Gram negative

* B. Rapid growing (doubling time 15 minutes)

* C. Acid fast

* D. Alpha hemolytic

Correct Answer: C

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58⟩ You would expect the time course of a typical patient with reactivation tuberculosis before they reach a point requiring hospitalization to take?

* A. A few hours

* B. 4 to 5 days

* C. 1-2 weeks

* D. Several weeks

Correct Answer: D

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59⟩ Symptoms of reactivation tuberculosis include?

* A. Weight loss

* B. Hypotension

* C. Nausea and vomiting

* D. Headache

Correct Answer: A

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60⟩ A 30 year old patient with advanced HIV infection (AIDS) is admitted to the hospital with a high fever. Blood cultures are performed and you receive a report from the laboratory that they are growing a mycobacteria. The one that is most likely is?

* A. Mycobacterium leprae

* B. Mycobacterium avium

* C. Mycobacterium kansasii

* D. Mycobacterium marinum

Correct Answer: B

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Microbiology

Home Medical Microbiology

124 Microbiology Questions And Answers

41⟩ Which of the following is the metabolically active form of Chlamydia trachomatis?

42⟩ Which of the following pathogens is unlikely to be a cause of nongonococcal urethritis?

43⟩ Which of the following statements concerning Chlamydia trachomatis infections is NOT correct?

44⟩ A 24-year-old pigeon fancier presents with fever to 40 degrees C, severe, diffuse headache, malaise, dry hacking cough and muscle aches. Lung exam reveals bilateral crackles and there is hepatosplenomegaly. The most likely pathogen causing this mans infection is?

45⟩ Which of the following statements regarding mycoplasmas is NOT correct?

46⟩ Which of the following is the most common clinical syndrome associated with Mycoplasma pneumoniae?

47⟩ Which of the following pathogens causes invasive joint disease in immuno-compromised hosts?

48⟩ Which of the following are characteristics that are shared by Mycoplasma hominis and Ureaplasma urealyticum?

50⟩ The major virulence factor of Haemophilus influenzae type b is?

51⟩ Important in the laboratory detection of Haemophilus influenzae is that it is?

52⟩ A common characteristic of Capnocytophaga, Moraxella, and Eikenella is that they?

53⟩ A common characteristic of Legionella species is that they?

54⟩ Most humans become infected with legionella by?

55⟩ Legionella infection is more common in patients who?

57⟩ An important characteristic of mycobacteria is that they are?

58⟩ You would expect the time course of a typical patient with reactivation tuberculosis before they reach a point requiring hospitalization to take?

59⟩ Symptoms of reactivation tuberculosis include?

60⟩ A 30 year old patient with advanced HIV infection (AIDS) is admitted to the hospital with a high fever. Blood cultures are performed and you receive a report from the laboratory that they are growing a mycobacteria. The one that is most likely is?

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Microbiology

Home Medical Microbiology

124 Microbiology Questions And Answers

41⟩ Which of the following is the metabolically active form of Chlamydia trachomatis?

42⟩ Which of the following pathogens is unlikely to be a cause of nongonococcal urethritis?

43⟩ Which of the following statements concerning Chlamydia trachomatis infections is NOT correct?

44⟩ A 24-year-old pigeon fancier presents with fever to 40 degrees C, severe, diffuse headache, malaise, dry hacking cough and muscle aches. Lung exam reveals bilateral crackles and there is hepatosplenomegaly. The most likely pathogen causing this mans infection is?

45⟩ Which of the following statements regarding mycoplasmas is NOT correct?

46⟩ Which of the following is the most common clinical syndrome associated with Mycoplasma pneumoniae?

47⟩ Which of the following pathogens causes invasive joint disease in immuno-compromised hosts?

48⟩ Which of the following are characteristics that are shared by Mycoplasma hominis and Ureaplasma urealyticum?

50⟩ The major virulence factor of Haemophilus influenzae type b is?

51⟩ Important in the laboratory detection of Haemophilus influenzae is that it is?

52⟩ A common characteristic of Capnocytophaga, Moraxella, and Eikenella is that they?

53⟩ A common characteristic of Legionella species is that they?

54⟩ Most humans become infected with legionella by?

55⟩ Legionella infection is more common in patients who?

57⟩ An important characteristic of mycobacteria is that they are?

58⟩ You would expect the time course of a typical patient with reactivation tuberculosis before they reach a point requiring hospitalization to take?

59⟩ Symptoms of reactivation tuberculosis include?

60⟩ A 30 year old patient with advanced HIV infection (AIDS) is admitted to the hospital with a high fever. Blood cultures are performed and you receive a report from the laboratory that they are growing a mycobacteria. The one that is most likely is?

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