Feline leukemia virus vaccine

1. A vaccine to aid in the prevention of disease due to FeLV comprising an immunogenic composition comprising a Venezuelan Equine Encephalitis (VEE) alphavirus RNA replicon particle that encodes a feline leukemia virus (FeLV) antigen, wherein the FeLV antigen is a FeLV glycoprotein (gp85) or an antigenic fragment thereof, and a pharmaceutically acceptable carrier.

2. The vaccine of claim 1 , wherein an antibody is induced in a feline when said feline is immunized with the vaccine.

3. The vaccine composition of claim 1 that further comprises at least one non-FeLV antigen for eliciting protective immunity to a non-FeLV feline pathogen.

4. The vaccine of claim 3 , wherein the non-FeLV feline pathogen is selected from the group consisting of feline herpesvirus (FHV), feline calicivirus (FCV), feline pneumovirus (FPN), feline parvovirus (FPV), feline infectious peritonitis virus (FIPV), feline immunodeficiency virus, borna disease virus (BDV), feline influenza virus, feline panleukopenia virus (FPLV), feline coronavirus (FCOV), feline rhinotracheitis virus (FVR), Chlamydophila felis , and any combination thereof.

5. The vaccine of claim 4 , wherein the non-FeLV antigen is a killed or attenuated non-FeLV antigen selected from the group of killed or attenuated non-FeLV antigens consisting of feline herpesvirus (FHV), feline calicivirus (FCV), feline pneumovirus (FPN), feline parvovirus (FPV), feline infectious peritonitis virus (FIPV), feline immunodeficiency virus, borna disease virus (BDV), feline influenza virus, feline panleukopenia virus (FPLV), feline coronavirus (FCOV), feline rhinotracheitis virus (FVR), Chlamydophila felis , and any combination thereof.

6. The vaccine of claim 5 , wherein the attenuated non-FeLV antigen is a modified live feline pathogen selected from the group consisting of a modified live Chlamydophila felis , a modified live feline rhinotracheitis Virus (FVR), a modified live feline calicivirus (FCV), a modified live feline panleukopenia virus (FPL), a modified live feline herpesvirus (FHV), a modified live feline pneumovirus (FPN), a modified live feline parvovirus (FPV), a modified live feline infectious peritonitis virus (FIPV), a modified live feline immunodeficiency virus, a modified live borna disease virus (BDV), a modified live feline coronavirus (FCOV), and a modified live feline influenza virus.

7. The vaccine composition of claim 1 , that further comprises an alphavirus RNA replicon particle comprising a nucleotide sequence encoding at least one protein antigen or an antigenic fragment thereof that originates from a non-FeLV antigen.

8. The vaccine of claim 7 , wherein the protein antigen or an antigenic fragment thereof that originates from a non-FeLV feline pathogen selected from the group consisting of feline herpesvirus (FHV), feline calicivirus (FCV), feline pneumovirus (FPN), feline parvovirus (FPV), feline infectious peritonitis virus (FIPV), feline immunodeficiency virus, borna disease virus (BDV), feline influenza virus, feline panleukopenia virus (FPLV), feline coronavirus (FCOV), feline rhinotracheitis virus (FVR), Chlamydophila felis , and any combination thereof.

9. The vaccine composition of claim 1 , that is a nonadjuvanted vaccine.

10. A method of immunizing a feline against a pathogenic FeLV comprising administering to the feline an immunologically effective amount of the vaccine of claim 9 .

11. The vaccine of claim 1 , further comprising a modified live feline calicivirus (FCV), a modified live feline panleukopenia virus (FPLV), a modified live feline rhinotracheitis virus (FVR), and an attenuated live strain of Chlamydophila felis.

12. The vaccine of claim 1 , wherein the FeLV antigen is a FeLV glycoprotein (gp85) that comprises an amino acid sequence comprising at least 95% identity with the amino acid sequence of SEQ ID NO: 2.

13. The vaccine of claim 1 , wherein the FeLV antigen is an antigenic fragment of the FeLV glycoprotein (gp85), and the antigenic fragment is FeLV (gp70).