Limitations of plasmid vaccines to complex viruses: selected myxoma virus antigens as DNA vaccines were not protective.
Myxoma virus, a poxvirus of the genus Leporipoxvirus, is the causative agent of the disease myxomatosis which is highly lethal in European rabbits (Oryctolagus cuniculus). Current vaccines to protect against myxomatosis are either attenuated live strains of the virus or the antigenically related rabbit fibroma virus. We examined the immune response of outbred domestic rabbits to the individual myxoma virus antigens M055R, M073R, M115L and M121R, delivered as DNA vaccines co-expressing rabbit interleukin-2 or interleukin-4. M115L and M121R were also delivered simultaneously. None of the vaccine constructs were able to protect the rabbits from disease or reduce mortality after challenge with virulent myxoma virus, despite induction of antigen-specific cell-mediated and humoral immune responses.
Adams
Mathew M
MM
School of Biochemistry and Molecular Biology, Faculty of Science, The Australian National University, Canberra, ACT 0200, Australia.
van Leeuwen
Barbara H
BH
Kerr
Peter J
PJ
D000818:Animals; D000956:Antigens, Viral / Q000235:genetics; D005822:Genetic Vectors; D009233:Myxoma virus / Q000235:genetics* / Q000276:immunology / Q000378:metabolism; D010957:Plasmids / Q000235:genetics; D011213:Poxviridae Infections / Q000517:prevention & control*; D011817:Rabbits; D014412:Tumor Virus Infections / Q000517:prevention & control*; D019444:Vaccines, DNA / Q000008:administration & dosage* / Q000235:genetics; D014765:Viral Vaccines / Q000008:administration & dosage* / Q000235:genetics
D000956:Antigens, Viral; D019444:Vaccines, DNA; D014765:Viral Vaccines