Multilocus sequence typing of uropathogenic ESBL-producing Escherichia coli isolated in a Brazilian community.
In the present study, multilocus sequence typing (MLST), pulsed-field gel electrophoresis (PFGE) and polymerase chain reaction detection of three resistance genes were combined to characterize seven uropathogenic E. coli isolated from outpatients. Selected portions of seven housekeeping and three antibiotic-resistance genes of the isolates were sequenced. The seven isolates were classified into four different sequence types (STs) by MLST and five PGFE types. Three isolates had a novel allelic profile representing a new ST designated as ST528 and showed the same PFGE and resistance genes. Two isolates, both characterized as ST359, were differentiated by PFGE and shared only one of the antibiotic-resistance genes studied. Comparison of MLST results with those of PFGE and resistance genes demonstrated that Escherichia coli had acquired different antibiotic-resistance genes and DNA rearrangements, causing alterations in PFGE patterns but maintaining the same ST. Furthermore, this article also reports the first detection of a CTX-M-2 ESBL E. coli and SHV-5 in a Brazilian community.
Minarini
Luciene A R
LA
Departamento de Análises Clínicas, Toxicológicas e Bromatológicas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, USP, Ribeirão Preto, SP, 14040-903, Brazil.
Camargo
Ilana L B C
IL
Pitondo-Silva
André
A
Darini
Ana Lúcia C
AL
D015373:Bacterial Typing Techniques; D001938:Brazil / Q000453:epidemiology; D004269:DNA, Bacterial / Q000032:analysis; D024881:Drug Resistance, Bacterial / Q000235:genetics; D016521:Electrophoresis, Gel, Pulsed-Field; D004926:Escherichia coli / Q000145:classification* / Q000201:enzymology / Q000235:genetics / Q000302:isolation & purification; D004927:Escherichia coli Infections / Q000453:epidemiology / Q000382:microbiology; D029968:Escherichia coli Proteins / Q000235:genetics; D006801:Humans; D016133:Polymerase Chain Reaction / Q000379:methods; D017422:Sequence Analysis, DNA; D014552:Urinary Tract Infections / Q000453:epidemiology / Q000382:microbiology*; D001618:beta-Lactamases / Q000096:biosynthesis* / Q000235:genetics
D004269:DNA, Bacterial; D029968:Escherichia coli Proteins; C071167:beta-lactamase CTX-2; C117193:beta-lactamase SHV-5; D001618:beta-Lactamases