%0 Journal Article
%T Characterization by pulsed-field gel electrophoresis of Salmonella Typhimurium isolates recovered in the acute diarrheal disease surveillance program in Colombia, 1997-2004 Caracterizaci¨®n por electroforesis de campo pulsado de aislamientos de Salmonella Typhimurium recuperados en el programa de vigilancia de enfermedad diarreica aguda en Colombia, 1997-2004
%A N¨¦lida Mu£¿oz
%A Mar¨ªa Elena Realpe
%A Elizabeth Casta£¿eda
%A Clara In¨¦s Agudelo
%J Biom¨¦dica
%D 2011
%I Instituto Nacional de Salud
%X Introduction. In Colombia Salmonella Typhimurium is the second most frequently isolated Salmonella serotype (after S. Enteritidis) from human clinical samples. This serotype represents 28.2% (n = 468) of the 1659 Salmonella isolates recovered by the Instituto Nacional de Salud (INS) Acute Diarrheal Diseases Surveillance Program from 1997 to 2004. Previously, little was known about the molecular attributes of these strains and commonality of genetic subtypes among S. Typhimurium isolated from humans in Colombia. Objective. The purpose of this study was to characterize S. Typhimurium isolates circulating in Colombia using pulsed-field gel electrophoresis in order to establish genetic profiles and determine their potential relatedness. Materials and methods. 468 S. Typhimurium isolates were submitted to INS by 14 Public Health Laboratories from January 1997 to December 2004. The pulsed-field gel electrophoresis was performed using restriction enzyme XbaI according to the PulseNet standard protocol (CDC, Atlanta). Restriction pattern analysis and cluster definition were performed using Molecular Analyst Fingerprinting II software. Results. 180 distinct electrophoretic patterns were obtained. Pattern COINJPX.X01.0062 was the most common (21.3% of the 473 isolates, n=101), followed by COINJPX.X01.0001 (8.4%, n=40), COINJPX.X01.0058 (3%, n=13), COINJPX.X01.0003 (2.5%, n=12), COINJPX.X01.0066 (2.3%, n=11), and COINJPX.X01.0108 (1.4%, n=6). COINJPX.X01.0001, was the most prevalent pattern among S. Typhimurium isolated in Bogot¨¢ from 1997-2002, but appeared to be replaced both in Bogot¨¢ and nationally by COINJPX.X01.0062 in 2003-2004. Cluster analysis demonstrated three distinct groups with 53% and 82% similarity indicating heterogeneity within the serotype. Conclusions. The study provides important electrophoretic pattern baseline data, which will be useful for prospective real-time comparison of profiles of future isolates. Cluster detection using this method will facilitate outbreak detection and will enhance our ability to find common sources for seemingly unrelated infections. Introducci¨®n. En Colombia, Salmonella Typhimurium es el segundo serotipo m¨¢s frecuentemente aislado en muestras cl¨ªnicas humanas despu¨¦s de S. Enteritidis, y representa el 28,2% (n = 468) de los 1.659 aislamientos recuperados en el programa de vigilancia por el laboratorio de enfermedad diarreica aguda liderado por el Grupo de Microbiolog¨ªa del Instituto Nacional de Salud. Objetivo. Caracterizar molecularmente los aislamientos de S. Typhimurium que circulan en el pa¨ªs con el fin de esta
%K Salmonella Typhimurium
%K vigilancia epidemiol¨®gica
%K diarrea
%K electroforesis en gel de campo pulsado
%K Colombia
%U http://www.revistabiomedica.org/index.php/biomedica/article/view/358