RESUMEN
In this study we report the first isolation of VanA-type vancomycin-resistant Enterococcus faecalis strains from two different patients hospitalized in the same intensive care unit at the hospital of Universidade Federal do Triângulo Mineiro (UFTM), Uberaba, Minas Gerais, Brazil.
Asunto(s)
Humanos , Masculino , Persona de Mediana Edad , Enterococcus faecalis/genética , Enterococcus faecalis/aislamiento & purificación , Infecciones por Bacterias Grampositivas , Técnicas In Vitro , Resistencia a la Vancomicina/genética , Técnicas y Procedimientos Diagnósticos , Genotipo , Métodos , Pacientes , Prevalencia , VirulenciaRESUMEN
Three Enterococcus faecalis and one Enterococcus faecium strains were characterized by plasmid profile, pulsed-field gel electrophoresis (PFGE) and determination of antimicrobial minimal inhibitory concentrations. VanA elements were characterized by Long PCR, overlapping PCR and DNA sequencing. Enterococcal strains showed resistance to vancomycin and harbored the vanA gene, and three these were teicoplanin susceptible while one showed intermediate resistance to teicoplanin. Two E. faecalis strains showed indistinguishable PFGE profile while the third was unrelated. E. faecalis strains showed a deletion in the right terminal region of the Tn1546-like element. The E. faecium strain showed an insertion element in the vanXY intergenic region. Mutations in VanA elements were not found. Rearrangements in the VanA element could be responsible for incongruities in genotype and phenotype in these strains.
Asunto(s)
Humanos , Antibacterianos/farmacología , Enterococcus faecalis , Enterococcus faecium , Teicoplanina/farmacología , Vancomicina/farmacología , Brasil , Proteínas Bacterianas/genética , Ligasas de Carbono-Oxígeno/genética , ADN Bacteriano/genética , Electroforesis en Gel de Campo Pulsado , Enterococcus faecalis/efectos de los fármacos , Enterococcus faecalis/genética , Enterococcus faecalis/aislamiento & purificación , Enterococcus faecium/efectos de los fármacos , Enterococcus faecium/genética , Enterococcus faecium/aislamiento & purificación , Genotipo , Pruebas de Sensibilidad Microbiana , Fenotipo , Reacción en Cadena de la Polimerasa , Análisis de Secuencia de ADN , Resistencia a la Vancomicina/genéticaRESUMEN
The isolation of vancomycin resistant enterococci (VRE) in Brazil has rapidly increased, following the world wide tendency. We report in the present study the first isolation of vancomycin resistant Enterococcus faecalis (VRE) in the Northeast of Brazil. The four VRE isolates were characterized for antimicrobial susceptibility, genotypic typing by macro restriction of chromosomal DNA followed by pulsed-field gel electrophoresis and for characterization of the Tn1546-like element and plasmid contents. The isolates showed resistance to multiple antibiotics and a single genotype profile, suggesting the dissemination of a single clone among the patients. Tn1546 associated to genetic elements as plasmids shows the importance of infection control measures to avoid the spreading of glycopetide resistance by conjugative transfer of VanA elements.
Asunto(s)
Humanos , Proteínas Bacterianas , Ligasas de Carbono-Oxígeno/genética , Infección Hospitalaria/microbiología , Enterococcus faecalis/genética , Infecciones por Bacterias Grampositivas/microbiología , Resistencia a la Vancomicina , Técnicas de Tipificación Bacteriana , Brasil , Infección Hospitalaria/diagnóstico , ADN Bacteriano/análisis , Electroforesis en Gel de Campo Pulsado , Enterococcus faecalis/efectos de los fármacos , Enterococcus faecalis/aislamiento & purificación , Genotipo , Infecciones por Bacterias Grampositivas/diagnóstico , Pruebas de Sensibilidad MicrobianaRESUMEN
This study reports the results about antimicrobial resistance of Enterococcus spp. isolated from intestinal tract of patients from a university hospital in Brazil. The identification of strains at species level was performed by conventional biochemical tests, API 20 Strep (bioMérieux), and polymerase chain reaction assay. The specie distribution was E. faecium (34 percent), followed by E. faecalis (33 percent), E. gallinarum (23.7 percent), E. casseliflavus (5.2 percent), E. avium (1 percent), and E. hirae (1 percent). Intrinsic resistance to vancomycin characterized by presence of vanC genes was found in E. gallinarum and E. casseliflavus. The high prevalence of VanC phenotype enterococci is very important because these species have been reported as causing a wide variety of infections. Vancomycin-resistant E. faecium or E. faecalis were not found and no one isolate of these species was a beta-lactamase producer. Thirteen clinical isolates of enterococci (13.4 percent) showed multiresistance patterns, which were defined by resistance to three classes of antibiotics plus resistance to at least one aminoglycoside (gentamicin and/or streptomycin). The resistance to several antimicrobials shown by enterococcal strains obtained in this study is of concern because of the decrease in the therapeutic options for treatment of infections caused by enterococci.