title: The immunogenicity of Haemophilus influenzae type b conjugate (HbOC) vaccine in human immunodeficiency virus-infected and uninfected infants.
abstract: Enzyme-linked immunosorbent assay polyribosyl ribitol phosphate (PRP) antibody responses to Haemophilus influenzae type b conjugate vaccine (HbOC) given at 2, 4 and 6 months of age were retrospectively compared in 23 human immunodeficiency virus (HIV) and 24 non-HIV-infected infants. HIV-infected infants were divided into those who were P1 (asymptomatic) or P2 (symptomatic) by 1 year of age. The P2 group was further divided into P2A (mildly symptomatic) and > P2A (rapidly symptomatic) by 1 year of age. The post-third HbOC dose geometric mean antibody titer to PRP was significantly lower in 12 P2 infants (0.43 microgram/ml) than either the 11 P1 infants (5.03 micrograms/ml, P < 0.05) or the 24 non-HIV infected infants (3.43 micrograms/ml, P < 0.05). Within the P2 group, the geometric mean antibody titer to PRP was significantly higher in 5 P2A infants (1.63 micrograms/ml) compared with 7 infants who were > P2A (0.17 microgram/ml, P < 0.05). After the third HbOC dose, PRP antibody titers were > or = 1.0 micrograms/ml for 4 of 12 P2 compared with 9 of 11 P1 infants (P < 0.05). Within the P2 group, PRP antibody titers were > 1.0 micrograms/ml for 4 of 5 P2A compared to 0 of 7 infants who were > P2A (P < 0.05). HIV-infected infants with PRP antibody titers > or = 1.0 micrograms/ml after the third HbOC dose had significantly higher mean CD4 counts (2842 cells/mm3) at the time of the third HbOC dose than those with lower PRP titers (1655 cells/mm3) (P < 0.05).(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Department of Pediatrics, University of Maryland School of Medicine, Baltimore 21201, USA.
authors.forename: K L
authors.initials: KL
authors.lastname: Kale
authors.forename: J C
authors.initials: JC
authors.lastname: King
authors.forename: J J
authors.initials: JJ
authors.lastname: Farley
authors.forename: P E
authors.initials: PE
authors.lastname: Vink
authors.forename: C O
authors.initials: CO
authors.lastname: Cimino
authors.forename: P R
authors.initials: PR
authors.lastname: Paradiso
mesh_terms: D000907:Antibodies, Bacterial / Q000096:biosynthesis*; D001426:Bacterial Proteins / Q000008:administration & dosage / Q000276:immunology*; D005260:Female; D015658:HIV Infections / Q000276:immunology* / Q000503:physiopathology; D006192:Haemophilus Infections / Q000276:immunology / Q000517:prevention & control*; D018073:Haemophilus Vaccines / Q000008:administration & dosage / Q000276:immunology*; D006193:Haemophilus influenzae / Q000276:immunology*; D006801:Humans; D007074:Immunoglobulin G / Q000096:biosynthesis*; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D011134:Polysaccharides / Q000096:biosynthesis*; D011379:Prognosis; D012189:Retrospective Studies; D014611:Vaccination
chemical_list: D000907:Antibodies, Bacterial; D001426:Bacterial Proteins; D018073:Haemophilus Vaccines; D007074:Immunoglobulin G; D011134:Polysaccharides; C061963:HibTITER protein, Haemophilus influenzae; C008984:polyribitol phosphate