Salmonella typhi vaccine compositions

摘要

A novel vaccine composition is provided which comprises: (a) a Salmonella typhi purified Vi polysaccharide; and (b) at least one other antigen wherein the vaccine components are stable and do not interfere with each other. The vaccine composition thus makes possible a single vaccination for protection against typhoid and other diseases such as hepatitis A, that travellers are prone to catch. Also described is a method of manufacturing Vi polysaccharide of S. typhi wherein the extraction and purification of the Vi polysaccharide is carried out in the absence of phenol.