ArticleAnnals of clinical microbiology and antimicrobials2015
Two novel CMY-2-type β-lactamases encountered in clinical Escherichia coli isolates.
Article in Annals of clinical microbiology and antimicrobials, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed.
- Disseminated multidrug-resistant Salmonella enterica serovar Dublin infection associated with plasmid-borne CMY-2 gene in a patient with travel to a farm in Mexico.European journal of clinical microbiology & infectious diseases : official publication of the European Society of Clinical Microbiology · 2026Article
- First Detection ofAntibiotics (Basel, Switzerland) · 2023Article
- Extended-Spectrum-β-Lactamase- and AmpC-ProducingAntibiotics (Basel, Switzerland) · 2021Article
- Molecular Characterization of Fecal Extended-Spectrum β-Lactamase- and AmpC β-Lactamase-ProducingFrontiers in microbiology · 2020Article
- Establishing a Role for Bacterial Cellulose in Environmental Interactions: Lessons Learned from Diverse Biofilm-Producing Proteobacteria.Frontiers in microbiology · 2015Review
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7 authors.
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Abstract
backgroundChromosomally encoded AmpC β-lactamases may be acquired by transmissible plasmids which consequently can disseminate into bacteria lacking or poorly expressing a chromosomal bla AmpC gene. Nowadays, these plasmid-mediated AmpC β-lactamases are found in different bacterial species, namely Enterobacteriaceae, which typically do not express these types of β-lactamase such as Klebsiella spp. or Escherichia coli. This study was performed to characterize two E. coli isolates collected in two different Portuguese hospitals, both carrying a novel CMY-2-type β-lactamase-encoding gene.
findingsBoth isolates, INSRA1169 and INSRA3413, and their respective transformants, were non-susceptible to amoxicillin, amoxicillin plus clavulanic acid, cephalothin, cefoxitin, ceftazidime and cefotaxime, but susceptible to cefepime and imipenem, and presented evidence of synergy between cloxacilin and cefoxitin and/or ceftazidime. The genetic characterization of both isolates revealed the presence of bla CMY-46 and bla CMY-50 genes, respectively, and the following three resistance-encoding regions: a Citrobacter freundii chromosome-type structure encompassing a blc-sugE-bla CMY-2-type -ampR platform; a sul1-type class 1 integron with two antibiotic resistance gene cassettes (dfrA1 and aadA1); and a truncated mercury resistance operon.
conclusionsThis study describes two new bla CMY-2-type genes in E. coli isolates, located within a C. freundii-derived fragment, which may suggest their mobilization through mobile genetic elements. The presence of the three different resistance regions in these isolates, with diverse genetic determinants of resistance and mobile elements, may further contribute to the emergence and spread of these genes, both at a chromosomal or/and plasmid level.
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