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[EVOLUTION OF BETA-LACTAM ANTIBIOTIC RESISTANCE IN ENTEROBACTER SPP. IN CROATIA]. 2016

Irena Franolić-Kukina, and Sanda Sardelić, and Nataša Beader, and Dijana Varda-Brkić, and Nataša Firis, and Marko Čačić, and Dorotea Šijak, and Sonja Frančula-Zaninović, and Vesna Elveđi-Gašparović, and Ivana Mareković, and Amarela Lukić-Grlić, and Mihaela Ajman, and Branka Bedenić

Enterobacter spp. develops resistance to expanded-spectrum cephalosporins by induction or derepression of chromosomal AmpC β-lactamase, or production of extended-spectrum β-lactamases (ESBLs) or carbapenemases. The aim of the study was to analyze the mechanisms of resistance to expanded-spectrum cephalosporins and the evolution of resistance mechanism during the study period (2008–2011) on a collection of 58 randomly collected Enterobacter spp. strains from three hospital centers in Croatia and Bosnia and Herzegovina during 2008-2010. The antibiotic susceptibility was determined by broth microdilution method according to CLSI. Resistance genes were determined by PCR. Plasmids were characterized by PCR-based replicon typing (PBRT). The hypothesis of the study was that there will be multiple mechanisms of ceftazidime resistance involved, from inducible and derepressed AmpC β-lactamases to extended-spectrum β-lactamases and carbapenemases at the end of the study. The isolates from different centers were expected to express different phenotypes and mechanisms of resistance. The study showed the predominance of derepressed AmpC β-lactamases combined with ESBLs belonging to CTX-M family as a mechanism of resistance to expanded-spectrum cephalosporins. The emergency of MBLs was reported in the last year of the study in University Hospital Center Zagreb. The plasmids encoding ESBLs belonged to different incompatibility groups. This points out to the evolution of β-lactam resistance in Enterobacter spp. from derepressed AmpC β-lactamases and ESBL to carbapenemases.

UI MeSH Term Description Entries
D008826 Microbial Sensitivity Tests Any tests that demonstrate the relative efficacy of different chemotherapeutic agents against specific microorganisms (i.e., bacteria, fungi, viruses). Bacterial Sensitivity Tests,Drug Sensitivity Assay, Microbial,Minimum Inhibitory Concentration,Antibacterial Susceptibility Breakpoint Determination,Antibiogram,Antimicrobial Susceptibility Breakpoint Determination,Bacterial Sensitivity Test,Breakpoint Determination, Antibacterial Susceptibility,Breakpoint Determination, Antimicrobial Susceptibility,Fungal Drug Sensitivity Tests,Fungus Drug Sensitivity Tests,Sensitivity Test, Bacterial,Sensitivity Tests, Bacterial,Test, Bacterial Sensitivity,Tests, Bacterial Sensitivity,Viral Drug Sensitivity Tests,Virus Drug Sensitivity Tests,Antibiograms,Concentration, Minimum Inhibitory,Concentrations, Minimum Inhibitory,Inhibitory Concentration, Minimum,Inhibitory Concentrations, Minimum,Microbial Sensitivity Test,Minimum Inhibitory Concentrations,Sensitivity Test, Microbial,Sensitivity Tests, Microbial,Test, Microbial Sensitivity,Tests, Microbial Sensitivity
D004754 Enterobacter Gram-negative gas-producing rods found in feces of humans and other animals, sewage, soil, water, and dairy products.
D004756 Enterobacteriaceae Infections Infections with bacteria of the family ENTEROBACTERIACEAE. Enterobacterial Infections,Cronobacter Infections,Infections, Enterobacteriaceae,Infections, Enterobacterial,Cronobacter Infection,Enterobacteriaceae Infection,Enterobacterial Infection,Infection, Cronobacter,Infection, Enterobacteriaceae,Infection, Enterobacterial,Infections, Cronobacter
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000900 Anti-Bacterial Agents Substances that inhibit the growth or reproduction of BACTERIA. Anti-Bacterial Agent,Anti-Bacterial Compound,Anti-Mycobacterial Agent,Antibacterial Agent,Antibiotics,Antimycobacterial Agent,Bacteriocidal Agent,Bacteriocide,Anti-Bacterial Compounds,Anti-Mycobacterial Agents,Antibacterial Agents,Antibiotic,Antimycobacterial Agents,Bacteriocidal Agents,Bacteriocides,Agent, Anti-Bacterial,Agent, Anti-Mycobacterial,Agent, Antibacterial,Agent, Antimycobacterial,Agent, Bacteriocidal,Agents, Anti-Bacterial,Agents, Anti-Mycobacterial,Agents, Antibacterial,Agents, Antimycobacterial,Agents, Bacteriocidal,Anti Bacterial Agent,Anti Bacterial Agents,Anti Bacterial Compound,Anti Bacterial Compounds,Anti Mycobacterial Agent,Anti Mycobacterial Agents,Compound, Anti-Bacterial,Compounds, Anti-Bacterial
D001426 Bacterial Proteins Proteins found in any species of bacterium. Bacterial Gene Products,Bacterial Gene Proteins,Gene Products, Bacterial,Bacterial Gene Product,Bacterial Gene Protein,Bacterial Protein,Gene Product, Bacterial,Gene Protein, Bacterial,Gene Proteins, Bacterial,Protein, Bacterial,Proteins, Bacterial
D001618 beta-Lactamases Enzymes found in many bacteria which catalyze the hydrolysis of the amide bond in the beta-lactam ring. Well known antibiotics destroyed by these enzymes are penicillins and cephalosporins. beta-Lactamase,beta Lactamase,beta Lactamases
D017522 Bosnia and Herzegovina A country of eastern Europe, formerly the province of Bosnia in Yugoslavia, uniting with the province of Herzegovina to form the Republic of Bosnia and Herzegovina in 1946. It was created 7 April 1992 as a result of the division of Yugoslavia and recognized by the United States as an independent state. Bosnia takes is name from the river Bosna, in turn from the Indoeuropean root bhog, "current"; Herzegovina is from the Serbian herceg (duke) + -ov (the possessive) + -ina (country or territory). Bosnia and Hercegovina,Bosnia-Herzegovina,Bosnia
D017523 Croatia Created 7 April 1992 as a result of the division of Yugoslavia.
D018440 beta-Lactam Resistance Nonsusceptibility of bacteria to the action of the beta-lactam antibiotics. Mechanisms responsible for beta-lactam resistance may be degradation of antibiotics by BETA-LACTAMASES, failure of antibiotics to penetrate, or low-affinity binding of antibiotics to targets. beta-Lactam Resistant,beta-Lactamase Resistance,beta-Lactamase Resistant,Resistance, beta-Lactamase,Resistant, beta-Lactamase,beta Lactam Resistance,beta Lactam Resistant,beta Lactamase Resistance,beta Lactamase Resistant

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