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[Haemophilus vaccines. Their importance in tropical pediatrics]
1Hôpital Trousseau, Paris.
Insights
Haemophilus influenzae type b (Hib) conjugate vaccines are crucial for preventing invasive infections in infants. These protein-conjugated vaccines offer improved immunogenicity and protection in young children, making them vital for infant immunization schedules.
Area of Science:
- Pediatrics
- Immunology
- Infectious Diseases
Background:
- Invasive infections caused by Haemophilus influenzae type b (Hib) are a significant concern, particularly purulent meningitis in infants under two years old.
- The polysaccharide (PRP) component of older Hib vaccines demonstrated poor immunogenicity and limited protective efficacy in this vulnerable age group.
Purpose of the Study:
- To highlight the importance of Haemophilus influenzae type b conjugate vaccines in preventing invasive infections in infants.
- To emphasize the superior immunogenic and protective capabilities of protein-conjugated Hib vaccines in young infants.
Main Methods:
- Review of existing literature on Haemophilus influenzae type b vaccines.
- Analysis of vaccine composition and immunogenicity data.
- Discussion of vaccine efficacy in preventing invasive Hib infections, especially meningitis.
Main Results:
- Protein-conjugated Haemophilus influenzae type b vaccines provide enhanced immunogenicity and protection in infants.
- These conjugate vaccines are recommended for inclusion in routine infant immunization schedules, ideally co-administered with other vaccines like DTP-Polio.
- Hib meningitis incidence is notably high in tropical regions, underscoring the potential utility of these vaccines in these areas.
Conclusions:
- Haemophilus influenzae type b conjugate vaccines are essential for protecting infants against invasive diseases like meningitis.
- Optimal vaccine efficacy is achieved when administered according to recommended infant immunization schedules.
- The cost-effectiveness and inclusion in Expanded Programs on Immunization (EPI) for tropical regions require further consideration.
Abstract:
Immunization with Haemophilus vaccine is undertaken to prevent invasive infections due to Haemophilus influenzae type b. Purulent meningitis is the most frequent chiefly in less than 2 years infants. Vaccine is composed of purified PRP which is poorly immunogenic and protective before two years. Actual vaccines are conjugate with protein which give them a protective and immunogenic power in very long young infants. They must be included in the schedule of infants immunizations, and fitting to other immunizations (DTP-Polio) is the best. The frequency of H. influenzae meningitis is high in tropics and those vaccines should be very useful. Cost of vaccine and inclusion in EPI are yet discussed for infants in tropical areas.