Strains of bacteria characterized by exhibiting: (a) a 7.alpha.-dehydroxylase activity of less than 50%, and (b) a bile acid deconjugation activity of less than 50%, and descendants, mutants and derivatives thereof preserving activities (a) and (b); and a pharmaceutical composition using one or more of such strains and use of same for preventing and treating diseases associated with or caused by an altered metabolism of bile acids.

Tensiones de las bacterias caracterizadas exhibiendo: (a) una actividad 7.alpha.-dehydroxylase de menos el de 50%, y (b) una actividad del deconjugation del ácido de bilis de menos el de 50%, y descendientes, mutantes y derivados de eso preservando las actividades (a) y (b); y una composición farmacéutica usando uno o más de tales tensiones y uso iguales para las enfermedades de prevención y que tratan asociadas a o causadas por un metabolismo alterado de los ácidos de bilis.

 
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