Pharmacology · single question
Which bacterium is resistant to clindamycin and is therefore NOT treated by clindamycin?
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Correct answer: D. Pseudomonas aeruginosa
- A. Staphylococcus aureus can be treated by clindamycin in sensitive strains (not MRSA).
- B. Streptococcus viridans is sensitive to clindamycin and penicillin.
- C. Fusobacterium is a gram-negative anaerobe sensitive to clindamycin and metronidazole.
- D. Correct. Pseudomonas aeruginosa is intrinsically resistant to clindamycin. Clindamycin covers gram-positive organisms and anaerobes — it has NO activity against Pseudomonas (a gram-negative aerobic bacillus). Pseudomonas requires anti-pseudomonal antibiotics (ciprofloxacin, piperacillin-tazobactam, etc.).