Micro & Immunology · single question
Which bacteria does clindamycin NOT treat?
Show answer and explanation
Correct answer: A. Pseudomonas aeruginosa
Pseudomonas aeruginosa is an aerobic gram-negative rod with intrinsic resistance to clindamycin. Clindamycin covers gram-positive aerobes (strep, staph MSSA) and anaerobes (Bacteroides, Fusobacterium, Prevotella) — making it excellent for odontogenic infections. Pseudomonas requires specific antibiotics (piperacillin-tazobactam, carbapenems, etc.).
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