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Vical Announces Breakthrough for Pandemic Influenza DNA Vaccines With Preliminary Human Data
Date:7/16/2008

hes. DNA vaccines encode certain proteins associated with a target pathogen, rather than using any part of the pathogen itself, and can prime the immune system as well as induce potent antibody and T-cell immune responses. DNA vaccines contain no viral particles, are non-infectious, and can be administered on a repeat basis without unwanted immune responses. Additionally, DNA vaccines have the potential to achieve proof of concept more quickly and cost-effectively than conventional vaccines, and can be manufactured using uniform methods of fermentation and purification, allowing significantly faster development and production.

Vical's monovalent vaccine contains a plasmid (a closed loop of DNA) encoding the hemagglutinin (HA) surface protein from the H5N1 influenza virus strain, A/Vietnam/1203/04. It is designed primarily to elicit antibody responses against the H5 protein but could elicit T-cell responses against H5 as well. Vical's trivalent vaccine contains the H5 plasmid plus separate plasmids encoding consensus sequences of two highly conserved influenza virus proteins: nucleoprotein (NP) and ion channel protein (M2). The trivalent vaccine is designed to elicit a combination of T-cell and antibody responses against all three proteins. Both vaccines are formulated with the company's Vaxfectin(R) adjuvant, which has demonstrated effectiveness with a variety of DNA vaccines in multiple animal models as well as dose-sparing and immune-enhancing ability in animals with a conventional seasonal influenza vaccine.

About Vical

Vical researches and develops biopharmaceutical products based on its patented DNA delivery technologies for the prevention and treatment of serious or life-threatening diseases. Potential applications of the company's DNA delivery technology include DNA vaccines for infectious diseases or cancer, in which the expressed protein is an immunogen; cancer immunotherapeutics, in which the expressed protein is an immune system stimu
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SOURCE Vical Incorporated
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