Neisseria meningitidis serogroup A and C capsular polysaccharide antigens (MenA/C CPS)

Neisseria meningitidis serogroup A and C capsular polysaccharide antigens are complex carbohydrate structures located on the outermost surface of the meningococcus bacteria. These polysaccharides serve as critical virulence factors by protecting the pathogen from host immune mechanisms, such as complement-mediated lysis and opsonophagocytosis (Source: WHO, Meningococcal meningitis). In the context of immunology, these antigens are the primary targets for vaccine development; the humoral immune system recognizes these epitopes to produce protective antibodies, while conjugate vaccine formulations further engage the cellular immune system to induce long-term immunological memory (Source: CDC, Meningococcal Vaccination). The interaction between these antigens and the immune system is characterized by the production of serogroup-specific IgG and IgM antibodies, which are measured clinically to determine vaccine efficacy. By targeting these polysaccharides, vaccines effectively prevent invasive diseases such as meningitis and septicemia caused by these specific serogroups (Source: StatPearls, Meningococcal Vaccine).

Other names

Meningococcal group A polysaccharideMeningococcal group C polysaccharideMenA antigenMenC antigenNeisseria meningitidis capsular polysaccharides

Vaccines containing these antigens stimulate B-lymphocytes to produce capsular-specific antibodies that facilitate opsonophagocytosis and complement-mediated lysis of the bacteria; conjugate forms also activate T-helper cells to provide long-lasting immune memory.