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Previously, we finely mapped the neutralizing epitopes recognized by foot-and-mouth disease virus (FMDV) type Asia1-specific mAb 3E11 and FMDV type O-specific mAb 8E8. In this study, we engineered recombinant FMDVs of the serotype Asia1 (rFMDVs) displaying the type O-neutralizing epitope recognized by the mAb 8E8. These epitope-inserted viruses were genetically stable and exhibited growth properties that were similar to those of their parental virus. Importantly, the recombinant virus rFMDV-C showed neutralization sensitivity to both FMDV type Asia1 and type O mAbs, as well as to polyclonal antibodies. These results indicated that this epitope-inserted virus has the potential to induce neutralizing antibodies against both FMDV type Asia1 and type O. Our results demonstrated that the G-H loop of FMDV type Asia1 effectively displays the protective neutralizing epitopes of other FMDV serotypes, making this an attractive approach for the design of novel FMDV vaccines.

journal of general virology

Insertion of type O-conserved neutralizing epitope into the foot-and-mouth disease virus type Asia1 VP1 G-H loop: effect on viral replication and neutralization phenotype