The present invention relates to the field of combined vaccine compositions which are effective against all forms of meningococcal diseases as well as typhoid fever. The vaccine formulations comprising antigens from capsular polysaccharides of Neisseria meningitidis A, Neisseria meningitidis C, Neisseria meningitidis Y, Neisseria meningitidis W135, Neisseria meningitidis X, Salmonella typhi Vi capsular polysaccharide (ViPs) or capsular ViPs conjugated to a carrier protein tetanus toxoid (ViPs-TT). This invention is also related to improved methods, especially the use of an improved feed media and an improved method of downstream processing and industrial purification of capsular polysaccharides. The vaccine is free of any animal component or alcohol and is in absolute compliance with respect to the religious sentiments of various ethnic groups. The composition is highly effective and stable, yet cost-effective and affordable, especially for lower-middle income and low-income countries.