Graduate Thesis Or Dissertation
 

DNA vaccines encoding the glycoprotein genes of spring viremia of carp virus, snakehead rhabdovirus, or infectious hematopoietic necrosis virus induce protective immunity in rainbow trout (Oncorhynchus mykiss) against an infectious hematopoietic necrosis virus lethal challenge

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  • Recent advances in DNA vaccine technology has brought about a promising strategy for the control of viruses that contain surface membrane glycoproteins. This type of vaccine involves the intramuscular injection of a bacterial plasmid containing a gene encoding a viral protein. The strategy uses eukaryotic processing of the protein as would naturally occur during a viral infection. In this study, plasmid DNA encoding the glycoproteins of infectious hematopoietic necrosis virus (pcDNA3-IHNV-g), snakehead rhabdovirus (pcDNA3-SHRV-g), or spring viremia of carp virus (pcDNA3-SVCV-g) was injected into the skeletal muscle of rainbow trout fry. At 30 days post-vaccination, fish were challenged with IHNV. Protection against IHNV was observed among all DNA vaccinated groups. Fish injected with plasmid pcDNA3-IHNV-g, pcDNA3-SHRV-g, or pcDNA3-SVCV-g had relative survival rates of 93.2%, 98.3% and 94.9%, respectively. The mechanisms for the viral mediated resistance induced by these glycoprotein based DNA vaccines is unknown. A parallel study conducted by Dr. Carol Kim on the production of Mx proteins in these fish indicates that the observed protection might be a consequence of the stimulation of interferon.
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