Foot-and-Mouth Disease Virus non-neutralizing capsid epitopes and nonstructural proteins (FMDV NSPs and non-neutralizing epitopes)

Foot-and-Mouth Disease Virus (FMDV) non-neutralizing capsid epitopes and nonstructural proteins (NSPs) are essential components in the study and management of FMD, a highly contagious viral disease affecting cloven-hoofed animals. While the viral capsid consists of four structural proteins (VP1, VP2, VP3, and VP4) that contain the primary neutralizing epitopes for vaccine-induced protection, the NSPs (such as 3ABC, 3D, 2C, and 3C) are expressed only during active viral replication. This distinction is the basis for the Differentiating Infected from Vaccinated Animals (DIVA) strategy, where the presence of antibodies against NSPs like 3ABC indicates a natural infection rather than vaccination with purified, inactivated virus. Biologically, these NSPs are responsible for critical viral processes, including the 3C protease-mediated cleavage of the viral polyprotein and the 3D polymerase-mediated replication of the RNA genome. Non-neutralizing epitopes on the capsid also contribute to the overall immune landscape and can be targets for diagnostic assays. Understanding these targets is vital for developing effective veterinary vaccines and robust surveillance tools to prevent the economic devastation associated with FMD outbreaks.

Other names

FMDV non-structural proteinsFMDV NSPs3ABC proteinFMDV non-neutralizing antigensFoot-and-mouth disease virus polyprotein

Induction of humoral and cellular immune responses for prophylaxis; diagnostic differentiation of infected from vaccinated animals (DIVA); inhibition of viral polyprotein cleavage or RNA replication.