title: Serum anticapsular antibody response in the first week after immunization of adults and infants with the Haemophilus influenzae type b-Neisseria meningitidis outer membrane protein complex conjugate vaccine.
abstract: Eight healthy adults and 48 infants 2 and 4 months old were immunized with Haemophilus influenzae type b-Neisseria meningitidis outer membrane protein complex conjugate vaccine (PRP-OMP) to evaluate antibody kinetics in the first days after immunization. Five adults (63%) had some decrease in antibody, although the geometric mean did not decrease significantly. With one exception, the nadir occurred on postimmunization day 3. Seven had an antibody increase by day 7. Of the children, 6 (75%) of 8 and 17 (77%) of 23 had a decrease in antibody in serum obtained on day 2-3 after the first or second dose, respectively, the magnitude of which directly correlated with the preimmunization antibody concentration. However, the geometric mean did not decrease significantly. Within 1 week of immunization, 85% of infants had an increase in antibody, significantly greater after the second dose than after the first. A high concentration of maternally derived antibody before immunization correlated negatively with antibody response. Thus, a transient decrease in antibody occurs in most adults and infants 2-3 days after immunization with PRP-OMP followed by a prompt increase by day 7.
authors.affiliation: Department of Pediatrics, Wyler Children's Hospital, University of Chicago, Illinois 60637.
authors.forename: R S
authors.initials: RS
authors.lastname: Daum
authors.forename: G R
authors.initials: GR
authors.lastname: Siber
authors.forename: G A
authors.initials: GA
authors.lastname: Ballanco
authors.forename: S K
authors.initials: SK
authors.lastname: Sood
mesh_terms: D000328:Adult; D000367:Age Factors; D000907:Antibodies, Bacterial / Q000096:biosynthesis* / Q000097:blood; D001425:Bacterial Outer Membrane Proteins / Q000276:immunology*; D001428:Bacterial Vaccines / Q000276:immunology*; D018073:Haemophilus Vaccines; D006801:Humans; D007112:Immunity, Maternally-Acquired; D007114:Immunization; D007117:Immunization, Secondary; D007223:Infant; D007700:Kinetics; D011135:Polysaccharides, Bacterial / Q000276:immunology*; D014614:Vaccines, Synthetic / Q000276:immunology
chemical_list: D000907:Antibodies, Bacterial; D001425:Bacterial Outer Membrane Proteins; D001428:Bacterial Vaccines; D018073:Haemophilus Vaccines; C061964:Haemophilus influenzae-type b polysaccharide-Neisseria meningitidis outer membrane protein conjugate vaccine; D011135:Polysaccharides, Bacterial; D014614:Vaccines, Synthetic