Extended spectrum beta lactamases (ESBL)

Extended spectrum beta lactamases (ESBLs) are enzymes that mediate resistance to extended-spectrum or third generation cephalosporins like ceftazidime, cefotaxime, and ceftriaxone and monobactams like aztreonam. ESBLs do not affect cephamycins like cefoxitin and cefotetan or carbapenems like meropenem or imipenem.

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