vaccines consisting of oligosaccharide ( os ) derived from haemophilus influenzae type b capsular polysaccharide and conjugated to carrier proteins had been shown capable of eliciting memory-type capsular polysaccharide of h. influenza type b antibody responses in human infants , but the structural variables governing immunogenicity were not defined .
C0028959
oligosaccharide
C0032594
polysaccharide