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Asociación entre la respuesta de anticuerpos a la toxina A y la protección contra la diarrea recurrente por
1Gerontology Division, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA. lkyne@caregroup.harvard.edu
Lancet (London, England)
|February 24, 2001
Resumen
Una respuesta inmune a la toxina A de Clostridium difficile durante la infección inicial protege contra su recurrencia. Los niveles más altos de anticuerpos, particularmente IgG, indican un menor riesgo de desarrollar infecciones recurrentes por C. difficile.
Área de la Ciencia:
- Inmunología Inmunología.
- Enfermedades infecciosas Enfermedades infecciosas.
- Microbiología Microbiología.
Sus antecedentes:
- Los portadores de Clostridium difficile exhiben una respuesta inmune a la toxina A.
- Investigaciones anteriores indicaron que los portadores sin síntomas tienen una respuesta inmune anamnestica a la toxina A.
- El estudio investiga si la inmunidad adquirida a la toxina A afecta el riesgo de recurrencia en la diarrea por C. difficile.
Objetivo del estudio:
- Para determinar si una respuesta inmune adquirida a la toxina A de Clostridium difficile influye en el riesgo de diarrea recurrente por C. difficile.
- Evaluar la correlación entre los niveles de anticuerpos contra las toxinas de C. difficile y la recurrencia de la enfermedad.
- Evaluar el papel protector de las subclases específicas de anticuerpos (IgA, IgG, IgM) contra la recurrencia de la infección por C. difficile.
Principales métodos:
- Estudio prospectivo de 63 pacientes con diarrea nosocomial por C. difficile.
- Muestras de suero en serie medidas para IgA, IgG e IgM contra la toxina A, la toxina B y los antígenos no tóxicos de C. difficile utilizando ELISA.
- Los pacientes fueron monitoreados durante 60 días para rastrear la recurrencia y los resultados.
Principales resultados:
- Una parte significativa de los pacientes (30%) falleció durante el período de estudio.
- Entre los sobrevivientes, 22 de 44 experimentaron diarrea recurrente por C. difficile.
- Las IgM séricas más altas contra la toxina A en el día 3 y las IgG en el día 12 se asociaron con un solo episodio de diarrea, lo que indica protección contra la recurrencia. Los bajos niveles de IgG predijeron un índice de probabilidades significativamente mayor para la recurrencia.
Conclusiones:
- Una respuesta elevada de anticuerpos séricos a la toxina A durante el episodio inicial de infección por C. difficile está relacionada con la protección contra la recurrencia.
- Las respuestas específicas de anticuerpos, particularmente IgG, juegan un papel crucial en la prevención de las infecciones recurrentes por C. difficile.
- Los hallazgos sugieren que la respuesta inmune a la toxina A es un factor clave en el curso de la enfermedad por C. difficile.
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