Vical Pandemic Influenza Vaccine Demonstrates Cross-reactivity Against California, Texas and Mexico H1N1 Strains
SAN DIEGO, Sept. 10, 2009 (GLOBE NEWSWIRE) -- Vical Incorporated (Nasdaq:VICL) announced today that the company's DNA vaccine against A/H1N1 pandemic influenza (swine flu) has demonstrated robust immune responses in 100% of vaccinated animals against virus strains isolated from recent outbreaks in three distinct geographic locations -- California, Texas and Mexico.
Vical's plasmid DNA vaccine contains the H1 hemagglutinin gene sequence provided by the U.S. Centers for Disease Control and Prevention (CDC) for the swine-origin A/California/04/09 pandemic influenza virus, and after two doses produced immune responses well above the accepted protection threshold in 100% of vaccinated mice and rabbits using HI assays against the swine-origin A/California/07/09 x-179a, A/Texas/15/09 and A/Mexico/4108/09 influenza viruses. Hemagglutination inhibition (HI) titers were well above the protection threshold of 40, ranging from 320 to 2,560 in mice, and from 640 to 2,560 in rabbits against the California strain. Results against the Texas and Mexico strains were essentially equivalent, ranging from 640 to 2,560 in both mice and rabbits. Vical's vaccine would also be expected to provide similar robust immune responses against other swine-origin A/H1N1 influenza virus subtypes, supporting selection of a single A/H1N1 virus strain as the basis for the vaccine.
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