当前位置： SCI文献检索 > ARCHIVES OF MEDICAL RESEARCH期刊下所有文献 > Extended-spectrum β-lactamase-producing enterobacteriaceae causing nosocomial infections in Mexico. A retrospective and multicenter study.

Extended-spectrum β-lactamase-producing enterobacteriaceae causing nosocomial infections in Mexico. A retrospective and multicenter study.

Abstract：

BACKGROUND AND AIMS:Extended-spectrum β-lactamase (ESBLs) production is still the most frequent mechanism of resistance to cephalosporins in gram-negative bacteria. The aim of the study was to identify the types of ESBL-producing Enterobacteriaceae clinical isolates causing nosocomial infections in Mexico. METHODS:ESBL production was performed using a disk diffusion method. The MIC for several antibiotics was performed by agar dilution on Mueller-Hinton. PFGE typing was carried out on all enterobacteria assayed. The β-lactamase pattern was obtained by IEF and bioassay. Genes of β-lactamases were amplified by PCR with specific primers and products were sequenced and analyzed using informatics programs. Plasmid isolation and conjugation experiments were carried out using standard methodologies. RESULTS:There were 134 isolates of Enterobacteriaceae included from a retrospective and multicenter study that included eight Mexican hospitals from 1999 to 2005. The most prevalent species were K. pneumoniae (56%), Enterobacter cloacae (29%), and Escherichia coli (15%). Molecular analysis identified the underlying endemic and polyclonal spread of enterobacterials in each hospital. The most frequent ESBLs identified were SHV-type (84%), TLA-1 (11%), and CTX-M-15 (5%). Successful matings were detected in 68.4% (71/104) isolates. CONCLUSIONS:ESBL-producer K. pneumoniae remains the most frequent bacterial species obtained in nosocomial infections. The SHV-type and TLA-1 ESBLs were disseminated in most hospitals analyzed and CTX-M-15 was emerging in one of the studied hospitals. This work highlights the proper use of antibiotics to avoid the selection of these types of multiresistant bacteria.

journal_name

Arch Med Res

journal_title

Archives of medical research

authors

Silva-Sanchez J,Garza-Ramos JU,Reyna-Flores F,Sánchez-Perez A,Rojas-Moreno T,Andrade-Almaraz V,Pastrana J,Castro-Romero JI,Vinuesa P,Barrios H,Cervantes C

doi

10.1016/j.arcmed.2011.02.004

subject

Has Abstract

pub_date

2011-02-01 00:00:00

pages

156-62

issue

2

eissn

0188-4409

issn

1873-5487

pii

S0188-4409(11)00043-9

journal_volume

42

pub_type

杂志文章,多中心研究

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