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Instituto Nacional de Salud Pública

2007, Número 5

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salud publica mex 2007; 49 (5)


Patogénesis molecular, epidemiología y diagnóstico de Escherichia coli enteropatógena

Vidal JE, Canizález-Román A, Gutiérrez-Jiménez J, Navarro-García F

Idioma: Español
Referencias bibliográficas: 100
Paginas: 376-386
Archivo PDF: 274.37 Kb.


RESUMEN

Escherichia coli enteropatógena (EPEC) es una de las principales causas de diarrea en niños menores de dos años en países en vías de desarrollo. La principal característica histopatológica de la infección es una lesión que induce la EPEC en el intestino conocida como la lesión A/E (adherencia y eliminación). Las bacterias se adhieren a los enterocitos y permiten la acumulación de la actina del citoesqueleto en la región apical de la célula, hasta formar una estructura de tipo “pedestal” y causar la eliminación de las microvellosidades intestinales. A pesar de que se conoce de modo detallado el proceso de formación de los pedestales de actina, aún no se ha esclarecido el mecanismo global de la diarrea que induce EPEC. La diarrea se ha vinculado con: a) la destrucción de las microvellosidades del enterocito, b) la salida masiva de iones hacia la luz intestinal y c) la secreción de alguna enterotoxina. En estudios realizados en países en vías de desarrollo se ha demostrado que EPEC es uno de los principales agentes participantes en la diarrea infantil, con elevadas tasas de morbilidad y mortalidad. El diagnóstico microbiológico de la infección se realiza con metodologías adicionales a las utilizadas con regularidad en el laboratorio de microbiología clínica, entre ellas las siguientes: a) serotipificación, b) ensayo de adherencia, c) prueba de FAS (tinción fluorescente para actina) y d) detección específica de genes que codifican a proteínas incluidas en la patogénesis, como el bfpA y eae. Un objetivo de esta revisión es actualizar los avances observados en la patogénesis molecular de la infección por EPEC, las metodologías para el diagnóstico microbiológico y la epidemiología en México y otros países en vías de desarrollo.


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