title: Repeated administration of a reduced-antigen-content diphtheria-tetanus-acellular pertussis and poliomyelitis vaccine (dTpa-IPV; Boostrix™ IPV).
abstract: BACKGROUND
  The rising incidence of pertussis amongst adults and adolescents in industrialized countries could be reduced by replacing tetanus and diphtheria (Td) boosters with reduced-antigen-content dT-acellular pertussis (dTpa)vaccines. Repeated administration of a dTpa-IPV (dTpa-inactivated poliomyelitis; BoostrixTM Polio, GlaxoSmithKline)booster to adolescents, 5 years after their previous dose was evaluated.
  
  
  RESULTS
  Before the second dTpa-IPV booster, the percentage of subjects who were seroprotected/seropositive was: 98.2% (D); 98.5% (T); 40.6% (PT); 99.7% (FHA); 97.0% (PRN); 98.8% (anti-polio 1); 99.7% (anti-polio 2); 97.0% (anti-polio 3). One month after the second dTpa-IPV dose, all subjects were seroprotected against D, T and polio and anti-pertussis booster responses (seroconversion or ≥2-fold increase) were seen in 93.3% (PT), 93.4% (FHA) and 95.2% (PRN) of subjects.During 4-day follow-up, 4.1% subjects recorded grade 3 pain; 4.6% and 3.6% recorded redness or swelling >50 mm, respectively. No serious adverse events were recorded. The incidence of symptoms was not higher than after the previous booster.
  
  
  METHODS
  415 subjects (mean age 11.4 years) who had received either dTpa-IPV or dTpa + IPV at age 4–8 years, all received one dose of dTpa-IPV in this open, phase IV trial. Blood samples were taken before and one-month post-vaccination. Antibody concentrations against D, T, pertussis toxoid (PT), filamentous haemagglutinin (FHA), pertactin (PRN) and polio antigens were determined. Reactogenicity and safety was assessed.
  
  
  CONCLUSIONS
  A second dTpa-IPV booster was highly immunogenic and well tolerated in this population of adolescents, supporting the repeated administration of BoostrixTM Polio. This study is registered at www.clinicaltrials.gov NCT00635128.
authors.affiliation: Zentrum fur Kinder-und Jugendmedizin, Universitatsmedizin, Rheinland-Pfalz, Germany.
authors.forename: Markus
authors.initials: M
authors.lastname: Knuf
authors.forename: Volker
authors.initials: V
authors.lastname: Vetter
authors.forename: Froilan
authors.initials: F
authors.lastname: Celzo
authors.forename: Gunasekaran
authors.initials: G
authors.lastname: Ramakrishnan
authors.forename: Olivier
authors.initials: O
authors.lastname: Van Der Meeren
authors.forename: Jeanne M
authors.initials: JM
authors.lastname: Jacquet
mesh_terms: D000293:Adolescent; D000907:Antibodies, Bacterial; D000914:Antibodies, Viral; D002648:Child; D002675:Child, Preschool; D004168:Diphtheria Toxoid / Q000008:administration & dosage* / Q000009:adverse effects / Q000276:immunology*; D015721:Diphtheria-Tetanus-Pertussis Vaccine / Q000008:administration & dosage* / Q000009:adverse effects / Q000276:immunology*; D006801:Humans; D007117:Immunization, Secondary / Q000379:methods*; D010567:Pertussis Vaccine / Q000008:administration & dosage* / Q000009:adverse effects / Q000276:immunology*; D011054:Poliovirus Vaccine, Inactivated / Q000008:administration & dosage* / Q000009:adverse effects / Q000276:immunology*; D013745:Tetanus Toxoid / Q000008:administration & dosage* / Q000009:adverse effects / Q000276:immunology*; D014611:Vaccination / Q000379:methods*; D017778:Vaccines, Combined; D014917:Whooping Cough / Q000453:epidemiology / Q000517:prevention & control*
chemical_list: D000907:Antibodies, Bacterial; D000914:Antibodies, Viral; C051021:DTPP vaccine; D004168:Diphtheria Toxoid; D015721:Diphtheria-Tetanus-Pertussis Vaccine; D010567:Pertussis Vaccine; D011054:Poliovirus Vaccine, Inactivated; D013745:Tetanus Toxoid; D017778:Vaccines, Combined