title: Immunogenicity of a combined DTPa-HB vaccine co-administered with Haemophilus influenzae type B conjugate vaccine (PRP-T) for primary and booster vaccinations.
abstract: OBJECTIVE
  To evaluate the immunogenicity of a combined DTPa-HB vaccine co-administered with Haemophilus influenzae type b conjugate vaccine (PRP-T) in Brazilian infants.
  
  
  METHODS
  A prospective and open clinical study, in which 110 infants were immunized with a three-dose primary vaccination regime at two, four and six months of age and with a single booster vaccination. Blood samples were drawn immediately before the first dose, one month after the third dose, at the time of the booster dose and one month after the booster to assess seropositivity and antibody geometric mean titers (GMTs) of antibodies for diphtheria, tetanus, hepatitis B, Haemophilus influenzae type b and for the three pertussis antigens: Pertussis Toxin (PT), Filamentous Hemagglutinin (FHA) and Pertactin (PRN).
  
  
  RESULTS
  Among the original 110 infants, 93 completed the study. Seropositivity was 100% for all seven involved antibodies, after the primary vaccination course. At the time of the booster dose, all antibodies (except diphtheria 33.7% and anti-PT 59%) were seropositive for more than 94% of subjects. After the booster, seropositivity increased to 100% for all antibodies. The GMT of these antibodies followed a similar pattern, with a strong increase after the primary course, followed by a second increase after the booster dose. At this time, GMT was 2- to 7-fold higher than after the primary course, for all vaccine components.
  
  
  CONCLUSIONS
  Concomitant administration of DTPa-HB and Hib vaccines elicited strong seroprotection for all the antigenic components. No interference with antibody response was evident. The vaccines provided high immunogenicity, following both the primary vaccinations and the booster dose.
authors.affiliation: Department of Pediatrics, Federal University of São Paulo, Rua Correa de Lemos 780, São Paulo, SP, Brazil. humberto@imunoclin.com.br
authors.forename: Humberto
authors.initials: H
authors.lastname: Bracco Neto
authors.forename: Anete
authors.initials: A
authors.lastname: Colucci
authors.forename: Rosana F
authors.initials: RF
authors.lastname: Puccini
authors.forename: Calil K
authors.initials: CK
authors.lastname: Farhat
mesh_terms: D000907:Antibodies, Bacterial / Q000097:blood*; D000914:Antibodies, Viral / Q000097:blood*; D001938:Brazil; D022681:Diphtheria-Tetanus-acellular Pertussis Vaccines / Q000008:administration & dosage / Q000276:immunology*; D004306:Dose-Response Relationship, Immunologic; D006192:Haemophilus Infections / Q000517:prevention & control; D018073:Haemophilus Vaccines / Q000008:administration & dosage / Q000276:immunology*; D006509:Hepatitis B / Q000517:prevention & control; D017325:Hepatitis B Vaccines / Q000008:administration & dosage / Q000276:immunology*; D006801:Humans; D007115:Immunization Schedule; D007117:Immunization, Secondary; D007223:Infant; D011446:Prospective Studies; D013742:Tetanus / Q000517:prevention & control; D013745:Tetanus Toxoid / Q000008:administration & dosage / Q000276:immunology*; D017778:Vaccines, Combined / Q000008:administration & dosage / Q000276:immunology
chemical_list: D000907:Antibodies, Bacterial; D000914:Antibodies, Viral; D022681:Diphtheria-Tetanus-acellular Pertussis Vaccines; D018073:Haemophilus Vaccines; C055753:Haemophilus influenza type b polysaccharide vaccine-tetanus toxin conjugate; D017325:Hepatitis B Vaccines; D013745:Tetanus Toxoid; D017778:Vaccines, Combined