Safety and immunogenicity of tetravalent pneumococcal vaccines containing 6B, 14, 19F and 23F polysaccharides conjugated to either tetanus toxoid or diphtheria toxoid in young infants and their boosterability by native polysaccharide antigens

Ron Dagan, Rimma Melamed, Orly Zamir, Odile Leroy

Research output: Contribution to journalArticlepeer-review

118 Scopus citations

Abstract

Background. New vaccines against pneumococcal infections in infancy are needed. We assessed in young infants the safety and immunogenicity of two tetravalent vaccines containing pneumococcal 6B, 14, 19F and 23F polysaccharides conjugated to either tetanus toxoid (Pnc-T) or diphtheria toxoid (Puc-D). Methods. Pnc-T or Pnc-D containing 3 μg of polysaccharide of each of the four pneumococcal polysaccharides or placebo were given intramuscularly in a double blinded fashion (25 infants per group) at 2, 4 and 6 months of age. At 12 months of age all 75 children were boosted with a 23-valent nonconjugate polysaccharide pneumococcal vaccine. Serum type- specific anticapsular antibody concentrations were measured at 2, 4, 6, 7, 12 and 13 months of age. Adverse events occurring within 72 h after each injection were recorded. Results. Both Pnc-T and Pnc-D were welltolerated. Pnc-T and Pnc-D had higher antibody concentrations compared with placebo after primary immunity (type 6B, 1.66, 1,40 and 0.60 μg/ml, respectively; type 14, 4.81, 2.65 and 2.22 μ/ml, respectively; type 19F, 2.40, 3.48 and 0.83 μg/ml, respectively; type 23F, 0.96, 0.44 and 0.35 μg/ml, respectively). Proportions of infants with concentrations above 1.0 μg/ml were also higher in the vaccine recipients than in those given placebo. After booster with the nonconjugate polysaccharide vaccine, both geometric antibody concentration and proportion with concentrations ≤1.0 μ/ml were significantly higher among either Pnc-T or Pnc-D recipients than among placebo recipients. Conclusions. Both Pnc-T and Pnc-D were well-tolerated, induced serotype-specific anticapsular antibodies and induced immunologic memory.

Original languageEnglish
Pages (from-to)1053-1059
Number of pages7
JournalPediatric Infectious Disease Journal
Volume16
Issue number11
DOIs
StatePublished - 1 Nov 1997

Keywords

  • Conjugated pneumococcal vaccines
  • Immunization
  • Infants
  • Streptococcus pneumoniae

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Microbiology (medical)
  • Infectious Diseases

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