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Preclinical Proof-of-Concept Studies Published for Novavax Seasonal Influenza Virus-Like-Particle Vaccine
Date:6/24/2009

Trivalent Virus-Like Particle Vaccine Elicits Protective Immune Responses against a Variety of Seasonal Influenza Strains in Mice and Ferrets

ROCKVILLE, Md., June 24 /PRNewswire-FirstCall/ -- Novavax, Inc. (Nasdaq: NVAX) announced today publication of the preclinical study results that supported the clinical development of the company's investigational VLP vaccine against the H3N2, H1N1 and B influenza strains. The study, which was conducted by scientists from the University of Pittsburgh, Center for Vaccine Research and Novavax, was published in the June 24, 2009 online issue of PLoS ONE. The vaccine contains three VLPs mixed together in a single formulation; each made up of the hemagglutinin (HA), neuraminidase (NA) and matrix 1 (M1) proteins from the representative strains. These proteins are important for broad protection against influenza, which is responsible for nearly 200,000 hospitalizations and 36,000 deaths in the U.S. each year. The vaccine is currently in Phase 2 clinical testing.

In this study, mice and ferrets received intramuscular injections of VLP vaccine which induced HAI antibodies against all three influenza strains represented in the vaccine and against a variety of drifted strains. All of the ferrets who received a vaccine dose of 15 mcg/strain, the dose used for currently licensed vaccines, developed HAI titers greater than or equal to 1:40. This level of antibody has been shown to be important for protection against flu in human studies of influenza vaccines. In addition, approximately 50% of ferrets developed HAI titers greater than or equal to 1:40 against drifted H3N2 strains from the 1999, 2002, and 2005 influenza seasons. The vaccine was also protective, reducing the amount of influenza virus in the nose of ferrets that were challenged with the H3N2 strain from the 2005
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