Abstract
During a survey of extended-spectrum β-lactamase (ESBL)-producing Enterobacteriaceae in Bulgaria in 2001–2002, three isolates from Sofia (two Escherichia coli, one Klebsiella pneumoniae) showed cefotaxime MICs that were decreased in the presence of clavulanate and were 2–8-fold higher than those of ceftazidime. Resistance was transferred to a sensitive recipient strain of E. coli. Both wild-type and transconjugant strains produced a cefotaxime-hydrolysing β-lactamase of pI 8.8. Sequencing of the PCR product obtained with oligonucleotide primers binding outside the coding region identified this β-lactamase as CTX-M-15. To our knowledge, this is the first report of CTX-M-15 in Bulgaria.
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