Rickettsia, Chlamydia and Mycoplasma
- Previous year questions on Rickettsia, Chlamydia and Mycoplasma for NEET PG (National Eligibility cum Entrance Test - Postgraduate), from the Microbiology section of the exam.
- Most questions here come from previous-year papers of Indian postgraduate medical entrance and licensing exams; where a paper and year are recorded the question carries them. The image-based questions are original vignettes written around an openly licensed figure, and were never asked in any exam.
- 54 live questions in Rickettsia, Chlamydia and Mycoplasma.
- 2 of 54 questions carry a verified exam year: 2018, 2019.
- Microbiology is worth about 20 of 300 questions on the exam. See every subject’s weightage.
- Question set last updated 6 Sept 2026.
Q1.Which of the following metabolizes arginine?
- AMycoplasma pneumoniae
- BMycoplasma genitalium
- CMycoplasma hominis✓ Correct answer
- DUreaplasma urealyticum
Q2.Jail fever is related to
- ARickettsia prowazekii✓ Correct answer
- BRickettsia conorii
- CRickettsia Akari
- DRickettsia Typhi
Q3.Chlamydia are isolated by
- AEnzyme immune assay
- BYolk sac inoculation✓ Correct answer
- CDirect immunofluorescence
- DMicroimmunofluorescence
Q4.In a patient with urethral syndrome, urine microscopy shows full of polymorphs, but no bacteria. The most appropriate culture medium is
- AMc Coy cell✓ Correct answer
- BThayer medium
- CCooked meat
- DPPLO broth
Q5.Which of the following needs cholesterol and other lipids for growth?
- AMycobacterium TB
- BChlamydia
- CHemophilus
- DMycoplasma✓ Correct answer
Q6.All are true about scrub typhus, except :
- ACausative organism is O. tsutsugamushi
- BVector is trombiculid mite
- CAdult female feeds on vertebrate hosts✓ Correct answer
- DTetracycline is the drug of choice
Q7.Mycoplasma organisms may also cause disease in non pulmonary sites. Which of the following is the most commonly affected non-pulmonary site?
- AMeningitis
- BProsthetic heart valve
- CSeptic arthritis
- DUrethritis✓ Correct answer
Q8.Lymphogranuloma venereum is caused by
- AChlamydia trachomatis✓ Correct answer
- BCalymmatobacterium granulomatis
- CHaemophilus ducreyi
- DTreponema pallidum
Q9.Tsutsugamushi causes:
- AEpidemic typhus
- BEndemic typhus
- CScrub typhus✓ Correct answer
- DQ fever
Q10.A 2 weeks old infant has conjunctivitis, which later developed into respiratory distress and pneumonia. Chest X-ray showed bilateral lung infiltrates. WBC count was 14,300/dL. Which of the following is the most likely organism?
- AChlamydia trachomatis✓ Correct answer
- BStreptococcus agalactiae
- CGonococcus
- DHaemophilus influenzae
Answer key
Q1: C. Mycoplasma hominis; Q2: A. Rickettsia prowazekii; Q3: B. Yolk sac inoculation; Q4: A. Mc Coy cell; Q5: D. Mycoplasma; Q6: C. Adult female feeds on vertebrate hosts; Q7: D. Urethritis; Q8: A. Chlamydia trachomatis; Q9: C. Scrub typhus; Q10: A. Chlamydia trachomatis.
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