Non-Sporing Anaerobes

Previous year questions on Non-Sporing Anaerobes 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.
19 live questions in Non-Sporing Anaerobes.
Microbiology is worth about 20 of 300 questions on the exam. See every subject’s weightage.
Question set last updated 6 Sept 2026.

Q1.About Bacteroids. True are all except
- ASusceptible to many antibiotics
- BPresent mainly in mixed infections
- CMost common species is B fragilis
- DBile resistant anerobes
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Q2.The organism which is involved in anaerobic infections of head and neck region is
- AStaphylococcus aureus
- BS. albus
- CStreptococci
- DBacteroids
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Q3.With reference to Bacteroides fragilis the following statements are true except:
- AB. fragilis is the most frequent anaerobe isolated from clinical samples
- BB. fragilis is sensitive to metronidazole
- CThe lipopolysaccharide formed by B. fragilis is structurally & functionally different from conventional endotoxin.
- DShock & DIC are common in Bacteroides bacteremia
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Q4.A 45-year-old white male with a history of alcohol abuse and periodontal disease is brought to the emergency room for a spiking fever and chills. Physical examination is significant for signs of lung consolidation. A chest x-ray shows a cavity in the right lower lobe that has an air/fluid level. A transtracheal aspiration is performed and the specimen is submitted to the laboratory for routine cultures and Gram's stain. Based upon the clinical presentation, which of the following would be the most likely finding?
- AAnaerobic bacteria
- BAspergillus fumigatus
- CEntamoeba histolytica
- DStaphylococcus aureus
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Q5.Which of the following is Gram positive:
- AVeillonella
- BBacteroides
- CFusobacterium
- DActinomyces
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Q6.An isolate from a wound culture is a Gram-negative rod identified as Bacteroides fragilis. Anaerobic infection with B. fragilis is characterized by
- AA foul-smelling discharge
- BA black exudate in the wound
- CAn exquisite susceptibility to penicillin
- DA heme-pigmented colony formation
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Q7.A patient presents with a frontal abscess. Foul-smelling pus is aspirated. Pus shows red fluorescence on the ultraviolet examination. The most likely organism causing the frontal abscess is
- APrevotella
- BPeptostreptococcus
- CPseudomonas
- DAcanthamoeba
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Q8.Infection occurring after man's bite is
- ASpirochetes
- BStaphylococcus
- CAnaerobic streptococci
- DCandida
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Q9.Which of the following is anaerobic:
- AE.coli
- BBacteroides
- CPseudomonas
- DKlebsiella
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Q10.Best specimen for anaerobic culture ?
- AExudates from wound
- BPus aspirated in a syringe
- CSwab from wound
- DMid-stream urine
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Answer key

Q1: A. Susceptible to many antibiotics; Q2: D. Bacteroids; Q3: D. Shock & DIC are common in Bacteroides bacteremia; Q4: A. Anaerobic bacteria; Q5: D. Actinomyces; Q6: A. A foul-smelling discharge; Q7: A. Prevotella; Q8: C. Anaerobic streptococci; Q9: B. Bacteroides; Q10: B. Pus aspirated in a syringe.

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Non-Sporing Anaerobes

Answer key

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