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

## TL;DR

This paper reviews the shift from traditional polysaccharide-based pneumococcal vaccines to new protein-based vaccines to better prevent pneumococcal diseases.

## Contribution

The paper systematically evaluates emerging protein-based vaccine strategies and their potential for broader protection against pneumococcal infections.

## Key findings

- Current polysaccharide vaccines have limitations like T-cell independence and limited strain coverage.
- Protein-based vaccines offer potential for serotype-independent protection and improved immune responses.
- Advances in antigen design and delivery systems could optimize next-generation pneumococcal vaccines.

## Abstract

Streptococcus pneumoniae (S. pneumoniae) is a leading cause of pneumonia, meningitis, and sepsis worldwide, posing a major threat to young children and older adults. In China, it is a key pathogen responsible for life-threatening invasive pneumococcal disease (IPD)—including pneumonia, bacteremia, and meningitis—and contributes substantially to hospitalizations and deaths each year. The high disease burden, together with rising antibiotic resistance, underscores the urgent need for more effective strategies for prevention and control. Currently, the most established pneumococcal vaccines include polysaccharide vaccines (e.g., PPV23) and polysaccharide conjugate vaccines (e.g., PCV13), both of which provide effective protection against pneumococcal infections. However, challenges remain, such as the T-cell-independent nature of polysaccharide antigens and inadequate coverage against prevalent strains, which hinder to improve their overall effectiveness. In this review, we trace the progression from pneumococcal pathogenesis to vaccine development. We first outline the mechanisms of colonization, invasion, and key virulence factors, and then critically summarize historical and current vaccine strategies. A systematic literature search was conducted in PubMed and Web of Science (2010–present) using relevant keyword and MeSH combinations. A total of 10,273 articles were identified from PubMed; after removal of duplicates and non-full-text records, 260 research articles were included in the final analysis. Based on this body of evidence, we evaluate emerging approaches toward broadly protective, serotype-independent vaccines and discuss how advances in antigen design, delivery systems, and adjuvants may further optimize next-generation pneumococcal vaccines.