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Streptococcus pneumoniae: virulence factors, pathogenesis, and vaccines
E AlonsoDeVelasco1, A F Verheul, J Verhoef
1Eijkman-Winkler Institute of Medical and Clinical Microbiology, University Hospital, Utrecht, The Netherlands.
Microbiological Reviews
|December 1, 1995
Summary
Understanding Streptococcus pneumoniae virulence factors is crucial for effective vaccines. Beyond capsular polysaccharides, bacterial components like cell walls and pneumolysin contribute significantly to disease severity.
Area of Science:
- Microbiology
- Immunology
- Vaccinology
Background:
- Streptococcus pneumoniae causes significant morbidity and mortality worldwide.
- Pneumococcal conjugate vaccines are nearing licensure, necessitating a deeper understanding of virulence factors.
- Host defense against S. pneumoniae primarily involves phagocytosis, requiring complement and anticapsular antibodies.
Purpose of the Study:
- To review major pneumococcal virulence factors involved in pathogenesis.
- To discuss the interference of these factors with host defense mechanisms.
- To inform the development of more effective pneumococcal vaccines.
Main Methods:
- Literature review of studies on Streptococcus pneumoniae pathogenesis.
- Analysis of experimental data on host-pathogen interactions.
- Evaluation of the role of bacterial structures in disease.
Main Results:
- Key virulence factors of S. pneumoniae include capsular polysaccharides, cell wall components, and pneumolysin.
- These factors interfere with host immune responses, particularly phagocytosis.
- Degradation products of pneumococci, such as cell wall fragments and pneumolysin, contribute to illness and death.
Conclusions:
- Effective pneumococcal vaccines should target not only capsular polysaccharides but also key inflammatory virulence factors.
- Further research into the immunomodulatory roles of pneumococcal components is warranted.
- Vaccine strategies incorporating multiple virulence targets may offer broader protection.