MCQs Bacteriology (61-70): Sexually Transmitted Infections

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 the microbiology lab. The 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 testwas done and was found to be positive.What is the most likely organism to be involved in this illness?

a) Haemophilus influenzaeb) Moraxella catarrhalisc) Neisseria gonorrheaed) Neisseria lactamicae) 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 syphilis7 years previously. The results of serologic tests for syphilis are as follows:Non treponemal test RPR: NonreactiveTreponemal test (TP-PA) reactiveWhich of the following statement is most correct?

a) The baby is at high risk for congenital syphilisb) The mother needs a lumbar puncture and a VDRL test for her CSF for neurosyphilisc) The mother needs to be treated again for syphilisd) 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 immunoassayb) Bacterial culture on selective mediac) Gram’s staind) Molecular diagnostics methodse) Serology

MCQ Bacteriology 64: A 20-year-oldwoman 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 gonorrhoeaeis cultured from her endocervix. The diagnosis is agonococcal pelvic inflammatory disease.What is the common sequela of this infection?

a) Cancer of the cervixb) Infertilityc) Urethral strictured) uterine fibriod tumors e) Vaginal-rectal fistula

MCQ Bacteriology 65: A 40-year-oldman is suffering from multiple episodes of disseminated gonococcal infection for thelast 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 factorb) Absent of lymphocyte adenosine deaminase activityc) Deficiency of a late-acting complement component C5, C6, C7 or C8d) Myeloperoxidase deficiencye) 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 burgdorferib) Epstein-Barr virusc) Streptococcus pyogenesd) Varicella-zoster viruse) 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 results?

a) Leprosyb) Lupus erythematosisc) Malariad) Measlese) 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 infectionb) Chlamydia trachomatis infectionc) Neisseria gonorrhoeae infectiond) Papilloma virus infectione) Treponema pallidum infection

MCQ Bacteriology 69: After returning from a community posting in a rural village in Nepal, a 20-year medical student was admitted to the hospital with chief complaints of fever (39oC ) and headache.  While history taking, he told that he had been 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 the diagnosis?

a) Culture of CSF on blood and chocolate agarb) Culture of urine on Human diploid fibroblast cellsc) Testing acute and convalescent-phase sera for antileptospiral antibodiesd) Testing acute and convalescent-phase sera using the RPR teste) 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?

a) Cattleb) Dogsc) Miced) Swinee) All of the above

Answer key of above MCQs on Microbiology: Sexually Transmitted Infections

• 1. b) Moraxella catarrhalis
• 1. d) The mother’s previous treatment for syphilis was effective
• 1. d) Molecular diagnostics methods
• 1. b) Infertility
• 1. c) Deficiency of a late-acting complement component C5, C6, C7 or C8
• 1. e) All of the above
• 1. e) All of the above
• 1. e) Treponema pallidum infection
• 1. c) Testing acute and convalescent-phase sera for anti leptospiral antibodies
• 1. e) All of the above

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