Poliovirus type 1 antigen, Poliovirus type 2 antigen, Poliovirus type 3 antigen (None; abbreviated nomenclature (e.g., PV1 antigen) is sometimes used in laboratory contexts, but not widely standardized)

The **polio virus antigens** are immunogenic structures present on the non-enveloped, icosahedral capsid of poliovirus serotypes 1, 2, and 3[3][5]. Each serotype possesses unique antigenic determinants (epitopes) that are recognized by neutralizing antibodies; these determinants overlap or lie adjacent to the binding site for the host cellular receptor CD155[1][5]. Structural studies show the epitopes are located around the fivefold symmetry axis (“canyon”) of the capsid, differing subtly between serotypes[1][5]. These antigens are the basis for polio vaccines, which expose the immune system to type-specific capsid proteins, inducing long-lasting protection against poliovirus infection[3][1][4]. They are not human proteins or classic pharmaceutical targets; rather, they are crucial for immune recognition and vaccine-mediated immunity.

Other names

Poliovirus antigen type 1Poliovirus antigen type 2Poliovirus antigen type 3PV1 antigenPV2 antigenPV3 antigenPoliovirus capsid antigen (less common)

Induction of protective immune response through antibody binding, neutralization of viral particles, prevention of virus-receptor interaction