Streptococcus pneumoniae capsular polysaccharides (CPS) (CPS)

Streptococcus pneumoniae capsular polysaccharides are the primary virulence factors of the pneumococcus bacterium, forming a protective outer layer that shields the pathogen from the host's immune system. These polysaccharides are chemically distinct across more than 100 identified serotypes, and they function by inhibiting opsonization and subsequent phagocytosis by host immune cells (Source: StatPearls, "Pneumococcal Vaccine"). In the context of pharmacology, these surface antigens serve as the essential components of pneumococcal vaccines, which aim to elicit a protective immune response. Conjugate vaccines (PCVs) link these polysaccharides to carrier proteins to induce a T-cell dependent response, while polysaccharide vaccines (PPSV) provide a T-cell independent response (Source: CDC, "Pneumococcal Disease"). By targeting these specific antigens, the vaccines enable the production of antibodies that facilitate the clearance of the bacteria, thereby preventing invasive diseases such as meningitis and bacteremia, as well as mucosal infections like pneumonia (Source: Mayo Clinic, "Pneumococcal vaccine"). The selection of specific serotypes for inclusion in vaccines is based on their prevalence in causing disease and their potential for antibiotic resistance (Source: WHO, "Pneumococcal vaccines").

Other names

Pneumococcal capsular polysaccharidesS. pneumoniae serotype-specific antigensPneumococcal surface polysaccharidesPneumococcal antigens

Induction of active immunity through the production of serotype-specific antibodies that promote opsonophagocytosis and neutralize the pathogen.