<prompt> The Haemophilus influenzae vaccine contains which of the followingLipopolysaccharide LPSLive attenuated H. influenzaePolypeptide antigens containing D-glutamatePolyribitol phosphate antigens  <response>: Polysaccharide vaccine Haemophilus influenzae type b is a bacterium with a polysaccharide capsule; the main component of this capsule is polyribosyl ribitol phosphate PRP. Anti-PRP antibodies have a protective effect against Hib infections. Thus, purified PRP was considered a good candidate for a vaccine Ref ananthnarayana microbiology textbook 8e 