The application relates to Clostridium difficile cell surface polysaccharides, compositions comprising Clostridium difficile cell surface polysaccharides, and includes kits, methods and uses thereof.Cette invention concerne des polysaccharides de surface cellulaire de Clostridium difficile, des compositions contenant des polysaccharides de surface cellulaire de Clostridium difficile ainsi que des trousses, méthodes et utilisations connexes.