Microbiology Quiz
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ANTIMICROBIALS AND RESISTANCE
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A clinical isolate of Klebsiella pneumoniae shows resistance to ceftriaxone and ceftazidime. A combination disk test reveals that the zone of inhibition for ceftazidime increases by >5 mm when tested with clavulanic acid. The isolate remains resistant to cefoxitin. What is the most likely mechanism of beta-lactam resistance in this isolate?
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