In this study the protective effects of a live attenuated bovine leukaemia provirus (pBLVDX) with deletion in the R3 and G4 genes were tested. Six out of six sheep appeared to resist challenge with parental BLV344. Two out of three animals transfected with pBLVDX were protected against challenge with bovine leukaemia virus (BLV) from a naturally infected cow. As a model for the protection against infection by members of the human T-lymphotropic virus/BLV group, these data provide evidence that a DNA-based vaccination with an attenuated provirus is able to protect against challenge infections.


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