Last updated on June 7th, 2021
MCQ Bacteriology 61: A 70-year-old woman with severe chronic lung disease presented in the OPD of Tribhuvan University Teaching Hospital with fever, productive cough with purulent sputum, and worsening hypoxemia. Sputum sample was collected and sent to microbiology lab. Lab reported plenty of polymorphonuclear leukocytes with both intracellular and extracellular gram-negative diplococci. This organism grows well on 5% sheep blood agar and chocolate agar. Later butyrate esterase test was done and was found to be positive.
What is the most likely organism to be involved in this illness?
a) Haemophilus influenzae
b) Moraxella catarrhalis
c) Neisseria gonorrheae
d) Neisseria lactamica
e) Neisseria meningitidis
MCQ Bacteriology 62: A 32 year old woman who is 10 weeks pregnant presents to the Obstetrics clinic for prenatal care. She has a history of treatment for syphilis 7 years previously. The results of serologic tests for syphilis are as follows:
Non treponemal test RPR: Nonreactive
Treponemal test (TP-PA) reactive
Which of the following statement is most correct?
a) The baby is at high risk for congenital syphilis
b) The mother needs a lumbar puncture and a VDRL test for her CSF for neurosyphilis
c) The mother needs to be treated again for syphilis
d) The mother’s previous treatment for syphilis was effective
MCQ Bacteriology 63: A 26-year-old sexually active woman presents to the OPD with purulent vaginal discharge and dysuria. While history taking, she admitted that she had unprotected sexual intercourse with a new partner a week ago.
Which of the following diagnostic tests will be the most sensitive method to find the etiologic agents involved in this case?
a) An enzyme immunoassay
b) Bacterial culture on selective media
c) Gram’s stain
d) Molecular diagnostics methods
MCQ Bacteriology 64: A 20-year-old woman who reports unprotected sex with a new partner 2 weeks previously develops fever and left lower quadrant abdominal pain with onset in association with her menstrual period. Neisseria gonorrhoeae is cultured from her endocervix. The diagnosis is a gonococcal pelvic inflammatory disease.
What is the common sequela of this infection?
a) Cancer of the cervix
c) Urethral stricture
d) uterine fibriod tumors
e) Vaginal-rectal fistula
MCQ Bacteriology 65: A 40-year-old man is suffering from multiple episodes of disseminated gonococcal infection for the last few years. Cultures of his urethra and knee fluid yield Neisseria gonorrhoeae.
What is the most likely cause for this infection?
a) A polymorphonuclear cell chemotactic factor
b) Absent of lymphocyte adenosine deaminase activity
c) Deficiency of a late-acting complement component C5, C6, C7 or C8
d) Myeloperoxidase deficiency
e) Selective IgA deficiency
MCQ Bacteriology 66: Infection with which of the following agents can result in a false positive nontreponemal (VDRL or RPR) test for syphilis?
a) Borrelia burgdorferi
b) Epstein-Barr virus
c) Streptococcus pyogenes
d) Varicella zoster virus
e) All of the above
MCQ Bacteriology 67: False positive nontreponemal (VDRL or RPR) test for syphilis is a common diagnostic problem. In which of the following conditions you can expect false positive VDRL or RPR result?
b) Lupus erythematosis
e) All of the above
MCQ Bacteriology 68: A 22 year old woman presents with a 2 cm ulcer on her labia majora. The lesion is painless and has a raised border. The differential diagnosis of this lesion includes:
a) Adenovirus infection
b) Chlamydia trachomatis infection
c) Neisseria gonorrhoeae infection
d) Papilloma virus infection
e) Treponema pallidum infection
MCQ Bacteriology 69: After returning from community posting from a rural village of Nepal, a 20 year old medical student admitted to the hospital with chief complaints of fever (39oC ) and headache. While history taking, the told that he had swimming in the pond while being in the village where cows are also taken for bathing. Based on the clinical examination, leptospirosis is suspected.
Which of the following test will help to confirm diagnosis?
a) Culture of CSF on blood and chocolate Agar
b) Culture of urine on Human diploid fibroblast cells
c) Testing acute and convalescent-phase sera for antileptospiral antibodies
d) Testing acute and convalescent-phase sera using the RPR test
e) Testing serum by dark-field examination for the presence of leptospires
MCQ Bacteriology 70: Which of the following animals is the source of the Leptospira interrogans?
e) All of the above
Answer key of above MCQs on Microbiology: Sexually Transmitted Infections
- 61. b) Moraxella catarrhalis
- 62. d) The mother’s previous treatment for syphilis was effective
- 63. d) Molecular diagnostics methods
- 64. b) Infertility
- 65. c) Deficiency of a late-acting complement component C5, C6, C7 or C8
- 66. e) All of the above
- 67. e) All of the above
- 68. e) Treponema pallidum infection
- 69. c) Testing acute and convalescent-phase sera for anti leptospiral antibodies
- 70. e) All of the above
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