CNTN2 and deltaretrovirus infections: We believe the newly-identified pBoLA-(gag) peptides, together with additional peptides that have been shown within gp51, gp30 and Tax proteins, will be important for inclusion in a multivalent antigen peptide vaccine for BLV that can provide protection against BLV infection caused by geographically distant viral strains in cattle that express different BoLA class II DRB3 haplotypes.