The protective level of serum antibodies to the capsular polysaccharide of Haemophilus influenzae type b.
D000907:Antibodies, Bacterial / Q000276:immunology*; D002675:Child, Preschool; D006192:Haemophilus Infections / Q000276:immunology / Q000517:prevention & control*; D006193:Haemophilus influenzae / Q000276:immunology; D006801:Humans; D007113:Immunity, Innate; D007223:Infant; D014611:Vaccination
D000907:Antibodies, Bacterial