Future Pneumococcal Vaccines: Shifting from Capsular Polysaccharides to Protein-Based Immunogens.

Area of Science:

• Microbiology
• Immunology
• Vaccinology

Background:

• Streptococcus pneumoniae is a major global cause of pneumonia, meningitis, and sepsis.
• Invasive pneumococcal disease (IPD) significantly contributes to hospitalizations and deaths, particularly in China.
• Rising antibiotic resistance necessitates improved prevention and control strategies.

Purpose of the Study:

• To review the progression of Streptococcus pneumoniae pathogenesis and vaccine development.
• To critically summarize historical and current pneumococcal vaccine strategies.
• To evaluate emerging approaches for broadly protective, serotype-independent vaccines.

Main Methods:

• Systematic literature search of PubMed and Web of Science (2010-present).
• Inclusion of 260 research articles from an initial pool of 10,273 identified records.
• Analysis of mechanisms of colonization, invasion, and virulence factors.

Main Results:

• Current polysaccharide and conjugate vaccines have limitations, including T-cell independence and inadequate strain coverage.
• Emerging approaches focus on antigen design, delivery systems, and adjuvants for next-generation vaccines.
• Advances aim for broader protection and serotype independence against S. pneumoniae.

Conclusions:

• Next-generation pneumococcal vaccines require innovation beyond current polysaccharide-based approaches.
• Optimizing antigen design, delivery systems, and adjuvants is crucial for enhanced vaccine efficacy.
• The development of serotype-independent vaccines holds promise for improved control of invasive pneumococcal disease.