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Objective To investigate the antimicrobial resistance profile of clinical isolates in Fuzhou First People's Hospital during 2015. Methods? The?bacterial?isolates?were?identified?using?ATB?Reader?semi-automatic?equipment?via?colorimetric?method.?The antimicrobial susceptibility was tested by disk diffusion method. The results were interpreted according to the CLSI breakpoints issued in 2015. All data were analyzed by WHONET 5.5 software. Results A total of 1215 non-duplicate clinical isolates were collected during 2015, including gram negative bacteria (70.6%) and gram positive bacteria (29.4%). The prevalence of MRSA was 50.0 % in S. aureus and the prevalence of MRCNS was 84.1 % in coagulase-negative Staphylococcus. Most MRSA strains (80.3?%)?were?resistant?to?erythromycin,?tetracycline?and?norfloxacin.?No?staphylococcal?isolate?was?found?resistant?to?vancomycin?or teicoplanin. The prevalence of ESBLs was 52.5% in E. coli and 34.7% in K. pneumoniae. Ten strains of Enterobacteriaceae were resistant to carbapenems. Less than10% of the P. aeruginosa isolates were resistant to amikacin, cefoperazone-sulbactam, meropenem and tobramycin. About 2.4% and 51.8% of the Acinetobacter isolates were resistant to polymyxin E and cefoperazone-sulbactam, respectively, while more than 75% of these strains were resistant to other commonly used antimicrobial agents. Conclusions Most of the clinical isolates are gram-negative bacilli in our hospital during 2015. Antimicrobial resistance remains an important clinical concern, which should be addressed seriously.
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INTRODUCTION: In the past two decades members of the genus Enterococcus have emerged as important nosocomial pathogens worldwide. This study prospectively analyzed the distribution of species and trends in antimicrobial resistance among clinical isolates of enterococci in a Brazilian tertiary hospital from 2006-2009. METHODS: Enterococcal species were identified by conventional biochemical tests. The antimicrobial susceptibility profile was performed by disk diffusion in accordance with the Clinical and Laboratory Standards Institute (CLSI). A screening test for vancomycin was also performed. Minimal inhibitory concentration (MIC) for vancomycin was determined using the broth dilution method. Molecular assays were used to confirm speciation and genotype of vancomycin-resistant enterococci (VRE). RESULTS: A total of 324 non-repetitive enterococcal isolates were recovered, of which 87 percent were E. faecalis and 10.8 percent E. faecium. The incidence of E. faecium per 1,000 admissions increased significantly (p < 0.001) from 0.3 in 2006 to 2.3 in 2009. The VRE rate also increased over time from 2.5 percent to 15.5 percent (p < 0.001). All VRE expressed high-level resistance to vancomycin (MIC >256µg/ mL) and harbored vanA genes. The majority (89.5 percent) of VRE belonged to E. faecium species, which were characteristically resistant to ampicillin and quinolones. Overall, ampicillin resistance rate increased significantly from 2.5 percent to 21.4 percent from 2006-2009. Resistance rates for gentamicin, chloramphenicol, tetracycline, and erythromycin significantly decreased over time, although they remained high. Quinolones resistance rates were high and did not change significantly over time. CONCLUSIONS: The data obtained show a significant increasing trend in the incidence of E. faecium resistant to ampicillin and vancomycin.
INTRODUÇÃO: Nas últimas duas décadas, os enterococos emergiram como importantes patógenos nosocomiais no mundo inteiro. Neste estudo, foi analisada a distribuição das espécies e a evolução da resistência aos antimicrobianos entre isolados clínicos de enterococos obtidos em um hospital terciário, no período de 2006 a 2009. MÉTODOS: As espécies foram identificadas por testes bioquímicos convencionais e o perfil de sensibilidade foi determinado pelo método de disco difusão. A sensibilidade à vancomicina foi também determinada pela triagem em agar e pela concentração inibitória mínima (CIM). Testes moleculares foram utilizados para confirmar as espécies e determinar os genótipos dos enterococos resistentes à vancomicina (VRE). RESULTADOS: Foram analisadas 324 amostras de enterococos, sendo 87 por cento E. faecalis e 10,8 por cento E. faecium. A incidência de E. faecium por 1.000 pacientes internados aumentou significativamente (p < 0,001) de 0,3 em 2006 para 2,3 em 2009. A taxa de VRE também aumentou significativamente de 2,5 por cento para 15,5 por cento (p < 0,001). Todos os VRE apresentaram genótipo VanA e CIM >256µg/mL para vancomicina. A maioria (89,5 por cento) dos VRE pertencia à espécie E. faecium e foram resistentes à ampicilina e quinolonas. Foi observado um aumento significativo na taxa de resistência à ampicilina, de 2,5 por cento (2006) para 21,4 por cento (2009). As taxas de resistência para gentamicina, cloranfenicol, tetraciclina e eritromicina diminuíram significativamente no período do estudo. Para as quinolonas, as taxas de resistência foram elevadas não alteraram significativamente, no período do estudo. CONCLUSÕES: Os resultados do presente estudo mostram um aumento significativo na incidência de E. faecium resistentes à ampicilina e vancomicina.