Streptococcus pneumoniae capsular polysaccharides (serotypes 1, 4, 5, 6B, 7F, 9V, 14, 18C, 19F, 23F) (PnPS (1, 4, 5, 6B, 7F, 9V, 14, 18C, 19F, 23F))

Streptococcus pneumoniae capsular polysaccharides are essential virulence factors consisting of complex carbohydrate polymers that encapsulate the bacterium (PubMed: 25852424). These polysaccharides function primarily by shielding the pathogen from the host's immune system, specifically by preventing opsonization and subsequent phagocytosis by immune cells (NIH: PMC3070672). The specific serotypes 1, 4, 5, 6B, 7F, 9V, 14, 18C, 19F, and 23F represent a significant portion of the strains responsible for invasive pneumococcal disease (IPD) worldwide (WHO: Pneumococcal vaccines). In pharmaceutical applications, these polysaccharides are used as antigens in vaccines to stimulate the production of protective antibodies. When these polysaccharides are chemically conjugated to a carrier protein, they elicit a T-cell dependent immune response, which is crucial for inducing long-term immunological memory and protection in infants and young children (StatPearls: NBK507794). By targeting these specific polysaccharides, vaccines effectively reduce the incidence of pneumonia, meningitis, and bacteremia caused by these serotypes.

Other names

Pneumococcal capsular polysaccharidesPnPSPCV10 antigens10-valent pneumococcal conjugate vaccine antigens

Induction of serotype-specific opsonizing antibodies (IgG) that facilitate phagocytosis and clearance of Streptococcus pneumoniae; conjugate vaccines specifically convert the T-independent polysaccharide response into a T-dependent response to induce immunological memory (StatPearls: NBK507794).