<prompt> The vaccine against Neisseria meningitidis containsWhole bacteriaCapsular polysaccharideSomatic O antigenLipopolysaccharide - protein complex  <response>: Monovalent and polyvalent vaccines containing capsular polysaccharide of Meningococci group A, C, W-135 and Y are available. Induces good immunity after a single dose in older children and adults Little value in children below the age of two years as polysaccharide antigen is T cell independent. Immunity is group specific. Reference: Textbook of Microbiology; Anathanarayan and panickers; 10th edition; Page no: 233 