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Rev. chil. infectol ; 26(1): 39-48, feb. 2009. ilus, tab
Article in Spanish | LILACS | ID: lil-508613

ABSTRACT

Objective: To typify by molecular and phenotypical methods, MRSA strains, isolated from patients and nurses to establish their possible clonal origin. Materials and Methods: 50 MRSA strains isolated in a teaching hospital in Maracaibo (Venezuela) were analyzed. The typification of MRSA strains was performed by means of pulsed-field gel electrophoresis (PFGE) and antibiotyping. Results: In patients, 12 clusters (I-XII) and 19 antibiotypes were found; whereas in the health-care personnel, 6 clusters (I-VI) and two antbiotypes were detected. There was no statistically significative association between antibiotypes and band patterns obtained by PFGE (p>0.05). Conclusions: By means of detection of resistance markers and PFGE, it is feasible to discrimínate the nature of the clinical strains of MRSA. The obtained results show the possible nosocomial transmission of MRSA strains and their clonal spread in hospital departments, particularly at the ICU.


Objetivo: Tipificar por métodos moleculares y fenotípicos, las cepas SAMR aisladas de pacientes y personal de enfermería para establecer su posible origen clonal. Materiales y Métodos: Se analizaron 50 cepas SAMR aisladas en un Hospital Universitario de Maracaibo (Venezuela). La tipificación se efectuó mediante electroforesis en gel de campo pulsado (EGCP) y antibiotipia. Resultados: Entre pacientes, se obtuvieron 19 antibiotipos y 12 grupos (I-XII); mientras que, en el personal de salud, por EGCP se detectaron seis grupos (I-VI) y dos antibiotipos. No se encontró asociación estadísticamente significativa entre los antibiotipos y patrones de bandas obtenidos por EGCP (p > 0,05). Conclusiones: Por medio de la detección de marcadores de resistencia y mediante la EGCP, es factible diferenciar la naturaleza de las cepas SAMR de origen clínico. Los resultados obtenidos demuestran la posible transmisión intrahospitalaria de cepas SAMR; así como, su diseminación clonal en los servicios del hospital, particularmente en la UCI, durante el período estudiado.


Subject(s)
Humans , DNA, Bacterial/analysis , Methicillin-Resistant Staphylococcus aureus/genetics , Anti-Bacterial Agents/pharmacology , Disk Diffusion Antimicrobial Tests , Electrophoresis, Gel, Pulsed-Field , Genotype , Hospitals, University , Methicillin-Resistant Staphylococcus aureus/drug effects , Methicillin-Resistant Staphylococcus aureus/isolation & purification , Personnel, Hospital , Phenotype
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