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Immunogenicity of Haemophilus influenzae type b polysaccharide-outer membrane protein conjugate vaccine in patients who acquired Haemophilus disease despite previous vaccination with type b polysaccharide vaccine
- Source :
- The Journal of pediatrics. 114(6)
- Publication Year :
- 1989
-
Abstract
- To investigate the basis of the immune defect in children who acquire invasive Haemophilus disease despite previous vaccination with Haemophilus influenzae type b (Hib) polysaccharide vaccine, we determined the ability of vaccine failure patients with low levels of serum anticapsular antibody (less than 1 microgram/ml) to respond to reimmunization. Thirty-four patients, ranging in age from 27 to 61 months, were vaccinated with either Hib polysaccharide (n = 20) or Hib polysaccharide-outer membrane protein conjugate vaccine (n = 14). All but three of the children had normal serum concentrations of immunoglobulins, including IgG2. The geometric mean serum anticapsular antibody concentration of the group given polysaccharide vaccine increased from 0.27 microgram/ml before vaccination to 0.65 microgram/ml 1 month later (p less than 0.05), but the magnitude of the response was nearly 10-fold less than that of 31 age-matched control children given polysaccharide vaccine (6.3 micrograms/ml, p less than 0.001). In contrast, all 14 patients with vaccine failure who were given conjugate vaccine showed increases of fivefold or more in serum anticapsular antibody (geometric means 0.35 and 12.8 micrograms/ml, respectively; p less than 0.001). All patients with vaccine failure who did not respond to polysaccharide vaccine were subsequently given conjugate vaccine, and all had high antibody responses. Most patients tested showed increases in complement-mediated serum bactericidal activity. These data suggest that immunization with conjugate vaccine confers protection against Hib disease to children who, because of genetic or other reasons, cannot respond to the unconjugated form of the polysaccharide vaccine.
- Subjects :
- Bacterial capsule
Male
Blood Bactericidal Activity
Haemophilus Infections
Immunoglobulins
chemical and pharmacologic phenomena
medicine.disease_cause
Polysaccharide Vaccine
Microbiology
Haemophilus influenzae
Conjugate vaccine
Polysaccharides
Haemophilus
medicine
Humans
Bacterial Capsules
Haemophilus Vaccines
biology
business.industry
Immunogenicity
Polysaccharides, Bacterial
Vaccination
Age Factors
biology.organism_classification
Virology
Antibodies, Bacterial
Child, Preschool
Immunoglobulin G
Pediatrics, Perinatology and Child Health
Bacterial Vaccines
Female
business
Vaccine failure
Bacterial Outer Membrane Proteins
Subjects
Details
- ISSN :
- 00223476
- Volume :
- 114
- Issue :
- 6
- Database :
- OpenAIRE
- Journal :
- The Journal of pediatrics
- Accession number :
- edsair.doi.dedup.....0e0e75f2e816b01495c522285ac9e4e8