Shigella and Salmonella
- Previous year questions on Shigella and Salmonella 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.
- 12 live questions in Shigella and Salmonella.
- 1 of 12 questions carries a verified exam year: 2018.
- Microbiology is worth about 20 of 300 questions on the exam. See every subject’s weightage.
- Question set last updated 6 Sept 2026.
Q1.All are catalase positive except
- AS. flexneri
- BS. boydii
- CS. dysenteriae type I✓ Correct answer
- DS. sonnei
Q2.All the following strains of Salmonella are motile by peritrichous flagella except
- AS. bongori
- BS. Gallinarum pullorum✓ Correct answer
- CS. choleraesuis
- DSalmonella enterica
Q3.Salmonella and shigella can be differentiated from other enterobacteriaceae member by isolation on:
- AMacConkey agar
- BMannitol salt agar
- CBCYE medium
- DXLD agar✓ Correct answer
Q4.The only Species of Shigella that produces exotoxin?
- AShigella sonnei
- BShigella flexneri
- CShigella boydii
- DShigella dysenteriae✓ Correct answer
Q5.A man had Egg omelet 1-4 hours back and developed diarrhea, vomiting and abdominal cramps. Most likely cause of poisoning is
- AStaphylococcus✓ Correct answer
- BSalmonella
- CBacillus cereus
- DClostridium
Q6.Catalase negative member of the family Enterobacteriaceae is
- ASalmonella typhi
- BProteus vulgaris
- CShigella dysenteriae serotype 1✓ Correct answer
- DEscherichia coli
Q7.Episodes of repeated thin stools with mucus, subjective feeling of fever and lower abdominal pain, with leukocytes in stool. Which of the following is likely?
- AGiardia
- BEntamoeba✓ Correct answer
- CStaph
- DClostridium perfringens
Q8.In a patient with typhoid, diagnosis after 15 days of onset of fever is best done by:
- ABlood culture
- BWidal test
- CStool culture✓ Correct answer
- DUrine culture
Q9.All are true about widal test except
- ABase lines differ depending on the endemicity of the disease
- BO antibodies last longer and hence is not indicative of recent infection✓ Correct answer
- CH antigen cannot differentiate between subtypes
- DHigh titre value in a single widal test is not confirmative
Q10.Reactive arthritis is usually caused by -
- AShigella flexneri✓ Correct answer
- BShigella boydii
- CShigella shiga
- DShigella dysenteriae
Answer key
Q1: C. S. dysenteriae type I; Q2: B. S. Gallinarum pullorum; Q3: D. XLD agar; Q4: D. Shigella dysenteriae; Q5: A. Staphylococcus; Q6: C. Shigella dysenteriae serotype 1; Q7: B. Entamoeba; Q8: C. Stool culture; Q9: B. O antibodies last longer and hence is not indicative of recent infection; Q10: A. Shigella flexneri.
Other topics in Microbiology
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- Immune System: Organisation, Function and Response
- Hypersensitivity
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