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Published on: February 23, 2014
The epidemiology and prevention of disease caused by Haemophilus influenzae type b
1Department of Pediatrics, Yale University School of Medicine, New Haven, CT 06510-8064.
Insights
New conjugate vaccines offer effective prevention against Haemophilus influenzae type b infections in infants. Ongoing research aims to optimize immunization schedules for maximum protection against this serious childhood disease.
Area of Science:
- Pediatrics
- Immunology
- Infectious Diseases
Background:
- Haemophilus influenzae type b (Hib) causes significant global disease, particularly in young children.
- Invasive Hib infections pose a severe health risk to infants worldwide.
- Recent advancements have led to the development of immunogenic Hib conjugate vaccines for infants.
Purpose of the Study:
- To review the efficacy and safety of newly developed Hib conjugate vaccines for infant immunization.
- To address remaining questions regarding the comparative efficacy of different Hib conjugate vaccines and immunization schedules.
- To explore optimal vaccination strategies, including combination schedules, for preventing Hib disease.
Main Methods:
- Review of clinical trial data on Hib conjugate vaccine efficacy in infants.
- Analysis of licensed Hib conjugate vaccines and their recommended immunization schedules in the United States.
- Discussion of ongoing research into vaccine immunogenicity and protective effects.
Main Results:
- Several Hib polysaccharide-protein conjugate vaccines have demonstrated efficacy in infants.
- Two Hib conjugate vaccines are licensed in the US for infant use, with a third anticipated.
- Clinical trials confirm the immunogenicity and efficacy of these vaccines in young children.
Conclusions:
- Hib conjugate vaccines represent a major advancement in preventing invasive Hib infections in children.
- Further research is needed to determine optimal vaccine choices and schedules for universal infant immunization.
- These vaccines provide a powerful tool for the effective prevention of a devastating childhood illness.
Abstract:
Disease caused by H. influenzae type b is a world-wide problem of major proportions that affects both developed and developing countries. Young children are at particularly high risk of developing serious invasive infections. There has been tremendous recent progress in the development of vaccines that are immunogenic even in young infants. Clinical trials have demonstrated the efficacy of these polysaccharide-protein conjugate vaccines in infants. Two of these vaccines have been licensed in the United States for use in infants, and licensure of a third conjugate vaccine is expected soon. Many questions still remain to be answered. Are there significant differences in the efficacy for infants of the different licensed conjugate vaccines? Are the differences in the recommended schedules of immunization for the different vaccines justified? Would a combination of an initial dose of PRP-OMP (which is the most immunogenic vaccine in 2-month-old children) followed by subsequent doses of HbOC or PRP-T provide better overall protection than a schedule that uses only a single vaccine? Although much more research remains to be done, these vaccines, which have been recommended for routine universal immunization of infants in the United States, give us the capability of effectively preventing this potentially devastating infection of children.
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