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Published on: September 19, 2016
[Haemophilus influenzae type B. Disease and prevention]
1Universitätsklinik für Kinder und Jugendliche Erlangen.
Abstract:
Haemophilus influenzae is a gram-negative rod, causing severe infections in childhood, including meningitis, sepsis, epiglottits, pneumonia and otitis. Most of the invasive infections are due to serotype b. Since ampicillin-resistance is increasing, modern cephalosporines like cefotaxime and ceftriaxone are the antibiotics of choice in severe disease. Bacterial meningitis due to Haemophilus influenzae and epiglottitis are both still life-threatening diseases with a lethality of 5% to 25%, and there are severe sequelae in 35% of meningitis cases. Efforts have been made to develop efficacious vaccines. While immunogenicity of type b polysaccharide was low in the high-risk age (below 18 months), conjugated vaccines with either diphtheria-toxoid or Neisseria meningitis outer membrane protein and the Hib polysaccharide were found to be strongly immunogenic even in the first months of life. These vaccines show every few side-effects and can easily be combined with other immunizations such as DPT and DT. Thus, the incidence of invasive infections due to Haemophilus influenzae type b might decline in future.
Insights
Haemophilus influenzae type b infections are serious childhood illnesses. Conjugated vaccines are highly effective and safe, offering hope for reduced incidence of invasive Haemophilus influenzae type b disease.
Area of Science:
- Microbiology
- Pediatrics
- Immunology
Background:
- Haemophilus influenzae, a gram-negative rod, causes severe childhood infections like meningitis and sepsis.
- Haemophilus influenzae type b (Hib) is responsible for most invasive infections.
- Increasing ampicillin resistance makes cephalosporins the primary treatment for severe Hib infections.
Purpose of the Study:
- To review the challenges and advancements in combating Haemophilus influenzae type b infections.
- To highlight the development and efficacy of conjugated vaccines against Hib.
Main Methods:
- Review of existing literature on Haemophilus influenzae infections and treatments.
- Analysis of vaccine development, focusing on polysaccharide conjugation and immunogenicity.
- Evaluation of vaccine safety and compatibility with routine immunization schedules.
Main Results:
- Conjugated Hib vaccines demonstrate strong immunogenicity, even in infants under 18 months.
- These vaccines have minimal side effects and can be co-administered with other vaccines.
- Conjugated vaccines represent a significant advancement over unconjugated polysaccharides.
Conclusions:
- Conjugated Haemophilus influenzae type b vaccines are effective and safe, offering a promising strategy for disease prevention.
- Widespread vaccination is expected to lead to a decline in invasive Hib infections.
- Continued research and vaccination efforts are crucial for controlling childhood bacterial meningitis and related sequelae.
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