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Haemophilus type B conjugate vaccine: postimmunization kinetics of IgM and IgG antibody responses in ten vaccinated
F Vincent-Ballereau1, C Lafaix, V Claudel-Daniel
1Laboratoire de Santé Publique, Faculté de Pharmacie de Nantes, France.
Insights
A new Haemophilus type b conjugate vaccine elicits a robust immune response in children. Both IgM and IgG antibodies against Haemophilus influenzae type b were detected within weeks of vaccination.
Area of Science:
- Immunology
- Vaccinology
- Pediatrics
Background:
- A novel conjugate vaccine for Haemophilus influenzae type b (Hib) is now available.
- This vaccine links the Hib capsular polysaccharide to tetanus toxoid.
Purpose of the Study:
- To investigate the immune response kinetics following a single dose of the Hib conjugate vaccine.
- To analyze the IgM and IgG antibody levels over a 4-week period post-vaccination in children.
Main Methods:
- Ten children aged 17-50 months received one dose of the Hib conjugate vaccine.
- Serum samples were collected at multiple time points: day 0, 2, 4, 7, 10, 14, 21, and 28.
- An ELISA method was employed to quantify IgM and IgG anti-polyribosylribitol phosphate (PRP) antibodies.
Main Results:
- A significant IgM response was observed starting around day 7 and sustained through day 28.
- IgG antibody levels demonstrated a steady and progressive increase from day 7 onwards.
- The vaccine effectively stimulated both early (IgM) and later (IgG) antibody production.
Conclusions:
- The Haemophilus type b conjugate vaccine induces a rapid and sustained antibody response in young children.
- The kinetics observed suggest the vaccine's potential for effective protection against Hib disease.
- This study provides crucial data on the immunogenicity of the Hib conjugate vaccine in a pediatric population.
Abstract:
A new Haemophilus type b conjugate vaccine coupling capsular polysaccharide of Haemophilus influenzae b to tetanus toxoid is available in France and other countries. We have studied the kinetics of the immune response in ten children aged 17 to 50 months during the 4 weeks after immunization with one dose of Haemophilus type b conjugate vaccine. Eight serum samples were collected from each child at day 0 (D0), D2, D4, D7, D10, D14, D21 and D28. An ELISA method has been used to discriminate between IgM and IgG classes of anti-polyribosylribitol phosphate antibodies. A high level of IgM appeared at D7 and persisted until D28. The increase in IgG was regular and progressive from D7.