PMID: 9384340Dec 31, 1997

Reduction of pneumococcal nasopharyngeal carriage in early infancy after immunization with tetravalent pneumococcal vaccines conjugated to either tetanus toxoid or diphtheria toxoid

The Pediatric Infectious Disease Journal
R DaganP Yagupsky

Abstract

Pneumococcal nasopharyngeal colonization is important for transmission of the organisms. We assessed the ability of two tetravalent conjugate vaccines administered in early infancy to prevent carriage of vaccine-related pneumococci. A vaccine containing pneumococcal type 6B, 14, 19F and 23F polysaccharide conjugated to tetanus toxoid (Pnc-T) and a vaccine containing the same four polysaccharides conjugated to diphtheria toxoid (Pnc-D) were compared with placebo, in a double blinded study (25 infants per group). Vaccines (or placebo) were injected at 2, 4 and 6 months of age. At 12 months of age a native (nonconjugate) polysaccharide vaccine was administered as a booster. Serum type-specific anticapsular antibody concentrations were measured and nasopharyngeal cultures were obtained at 2, 4, 6, 7, 12 and 13 months of age. In general carriage of all pneumococci (vaccine- and non-vaccine-related) was low at age 2 months and increased with age. However, for the vaccine-related serotypes (6A, 6B, 14, 19F and 23F) carriage was not increased with age in Pnc-D or Pnc-T recipients. Of all cultures obtained after the full primary series, 7 of 72 (10%), 3 of 62 (5%) and 19 or 70 (27%) were positive for the vaccine-related pneumococcal ser...Continue Reading

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Related Concepts

Bacterial Vaccines
Carrier of Disorder
Diphtheria toxoid vaccine, inactivated
Double-Blind Method
Variolation
Structure of Choanae
Streptococcus pneumoniae
Tetanus Vaccine
Vaccines, Conjugate
Pneumovax

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