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Experimental Human Pneumococcal Carriage
Published on: February 15, 2013
Pneumococcal vaccines: do they prevent infection and how?
Klara M Posfay-Barbe1, Ellen R Wald
1Children's Hospital of Pittsburgh, Division of Allergy, Immunology and Infectious Diseases, Pittsburgh, Pennsylvania 15213, USA.
Current Opinion in Infectious Diseases
|May 29, 2004
Summary
The heptavalent pneumococcal conjugate vaccine significantly reduced invasive pneumococcal disease in young children. While it also decreased acute otitis media, non-vaccine serotypes are emerging as a concern.
Area of Science:
- Epidemiology of infectious diseases
- Vaccinology and immunology
- Public health and preventive medicine
Background:
- Streptococcus pneumoniae causes significant invasive and respiratory tract infections globally.
- The heptavalent pneumococcal conjugate vaccine (PCV7) was introduced in the US in 2000 to combat pneumococcal disease.
- Ongoing surveillance is crucial for understanding disease trends and vaccine effectiveness.
Purpose of the Study:
- To review and synthesize current epidemiological data on Streptococcus pneumoniae infections.
- To summarize early findings on the effectiveness of the heptavalent pneumococcal conjugate vaccine (PCV7).
- To assess the impact of PCV7 on disease prevalence and serotype distribution.
Main Methods:
- Review of published epidemiological studies on Streptococcus pneumoniae infections.
- Analysis of early effectiveness data from PCV7 vaccination programs.
- Examination of global studies on pneumococcal serotype prevalence and vaccine impact.
Main Results:
- Dramatic reduction in invasive pneumococcal infections (bacteremia, meningitis) in children under 5.
- Simultaneous decrease in serious infections in older age groups due to reduced transmission.
- Modest reduction in acute otitis media cases, with an increase in non-vaccine serotype infections.
Conclusions:
- PCV7 has successfully decreased invasive pneumococcal disease and moderately reduced respiratory infections.
- Emergence of non-vaccine serotypes necessitates ongoing monitoring.
- Continued surveillance is vital for tracking pneumococcal disease trends and vaccine durability.
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