<prompt> The following vaccine is developed against cholera -DukoralVi polysaccharideTy 21a oralNone  <response>: Two types of oral cholera vaccines : Dukoral and Sanchol Vi polysaccharide and Ty 21a oral are typhoid vaccines. Ref: PARK;S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 23rd edition , Page :233 