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Extended-Spectrum β-Lactamase Enzymes in Clinical Isolates of Enterobacter Species from Lagos, Nigeria

ABSTRACT Over a 9-month period, 8 of 40 nonduplicate isolates of Enterobacter spp. producing extended-spectrum β-lactamase (ESBL) were detected for the first time from two hospitals in Lagos, Nigeria. Microbiologic and molecular analysis confirmed the presence of ESBL. Only four isolates transferred ESBL resistance as determined by the conjugation test, and pulsed-field gel electrophoresis showed genetically unrelated isolates.