has role protective antigen role protective antigen Feline leukemia virus protein Gag Protegen ID: 466; NCBI Protein GI: 323916; NCBITaxon: 11768 Oliver He The vaccine, (EURIFEL FeLV; Merial) that expresses the FeLV env and gag protective genes, is effective against any oronasal FeLV challenge. The protection was shown to be solid against an oronasal challenge one year after the initial vaccination, and was effective against a very severe 'in-contact' challenge [PubMed: 12934796]. protein Allen Xiang