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Genotyping of Staphylococcus aureus by Ribosomal Spacer PCR (RS-PCR)
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Un vínculo entre la virulencia y la abundancia ecológica en poblaciones naturales de Staphylococcus aureus
N P Day1, C E Moore, M C Enright
1Centre for Tropical Medicine, Nuffield Department of Clinical Medicine, University of Oxford, John Radcliffe Hospital, Oxford OX3 9DU, UK. nick.day@ndm.ox.ac.uk
Science (New York, N.Y.)
|April 9, 2001
Resumen
Ciertos genotipos de Staphylococcus aureus (S. aureus) se transmiten con frecuencia sin síntomas y están desproporcionadamente relacionados con infecciones graves. Esto sugiere que los rasgos que mejoran la aptitud ecológica de S. aureus también aumentan su virulencia.
Área de la Ciencia:
- Microbiología Microbiología.
- Enfermedades infecciosas Enfermedades infecciosas.
- Epidemiología La epidemiología.
Sus antecedentes:
- El Staphylococcus aureus es un patógeno humano significativo que causa infecciones graves.
- Una gran proporción de la población es portadora asintomática de S. aureus, particularmente en la cavidad nasal.
- Comprender la relación entre el transporte y la enfermedad es crucial para el control de la infección.
Objetivo del estudio:
- Caracterizar aislamientos de Staphylococcus aureus de transporte nasal asintomático y enfermedad grave dentro de una población definida.
- Para identificar genotipos específicos de S. aureus asociados con el transporte y la infección.
- Investigar el vínculo entre la aptitud ecológica y la virulencia en S. aureus.
Principales métodos:
- Se empleó la tipificación de secuencia multilocus (MLST) para el genotipo de aislados de S. aureus.
- Se recogieron aislamientos de portadores nasales asintomáticos y pacientes con infecciones graves de S. aureus.
- Se compararon las frecuencias de los genotipos en los grupos de transporte y enfermedad, ajustando por la abundancia relativa.
Principales resultados:
- Se identificaron varios genotipos de S. aureus transportados con frecuencia.
- Se encontró que estos genotipos de transporte común están desproporcionadamente representados entre los aislados que causan enfermedades graves.
- La sobrerrepresentación persistió incluso después de tener en cuenta su prevalencia en la población de portadores asintomáticos.
Conclusiones:
- El estudio identificó clones hipervirulentos de S. aureus que son ecológicamente abundantes y predispuestos a causar infecciones graves.
- Los factores que contribuyen a la aptitud ecológica de S. aureus también pueden aumentar su virulencia.
- Este hallazgo tiene implicaciones para la comprensión de la evolución de los patógenos y el desarrollo de intervenciones específicas.
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