Vical Pandemic Influenza Vaccines Achieve T-Cell Responses and Cross-Clade Reactivity... (and the conserved NP and M2 antigens wer...)

Vical Pandemic Influenza Vaccines Achieve T-Cell Responses and Cross-Clade Reactivity in Humans

Date:12/11/2008

and the conserved NP and M2 antigens were detected in a majority of subjects receiving the trivalent vaccine. Responses against conserved antigens could provide protection against serious disease or death during an outbreak of a new strain of influenza for which a vaccine had not yet been developed.

Vical had previously reported that the monovalent vaccine achieved potentially protective levels of antibody responses (H5 hemagglutination inhibition, or HI, titers of at least 40 and at least a four-fold increase from baseline) in at least 50% and up to 67% of evaluable subjects in a 100-subject Phase 1 trial. In the two monovalent vaccine cohorts receiving the highest H5 DNA dose (1 mg), 80% to 100% of the responders had sustained responses through Day 182.

Vical's monovalent vaccine contained a plasmid (a closed loop of DNA) encoding the hemagglutinin (HA) surface protein from the H5N1 influenza virus strain, A/Vietnam/1203/04. It was 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 was designed to elicit a combination of T-cell and antibody responses against all three proteins. Both vaccines were 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.

RapidResponse(TM) DNA Vaccine Manufacturing Update

New data presented at the current conference indicates that a single injection of a Vaxfectin(R)-formulated influenza vaccine produced by the company's RapidResponse(TM) manufacturing system prov
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Vical Pandemic Influenza Vaccines Achieve T-Cell Responses and Cross-Clade Reactivity...(and the conserved NP and M2 antigens wer...),Health