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NOVAVAX Announces Publication of a Preclinical Study Demonstrating that a Virus-like Particle Vaccine Provided Protection Against Highly Pathogenic H1N1 and H5N1 Influenza Strains
Date:4/14/2009

produced in insect cells, formed three-dimensional structures that mimic the 1918 pandemic influenza virus but without the genetic material needed for replication. The mechanism of action by which this H1N1 VLP vaccine candidate provided broad cross-protection is under further study, but the scientists described preliminary evidence that antibody cross-reactivity between the HA and possibly NA proteins of the H1N1 and H5N1 influenza were important.

"Unlike other non-live influenza vaccines, the VLPs are uniquely positioned to stimulate immunity through multiple mechanisms," said Dr. Penny Heaton, Chief Medical Officer at Novavax. "First, they contain HA protein that is the same structure as the live virus, which may stimulate HA antibodies of several types that not only prevent the virus from attaching to cells but also prevent the virus from fusing with cells. Second, the VLPs contain NA which may stimulate production of antibody that prevents spread of the virus down the respiratory tract. Finally, the structure of the HA and NA proteins and the way in which they are embedded in lipids on the surface of the VLP may activate the innate immune system providing protection against both the H1N1 and H5N1 strains," said Dr. Heaton.

Although cross protection against influenza strains of the same hemagglutinin or HA type has been achieved through the use of vaccines with adjuvants (e.g., cross-protection against H5N1 A/Vietnam and A/Indonesia strains), protection against strains with different HA types, as shown in this study, has not been reported. Cross-protection against different HA types is highly desirable for pandemic influenza vaccine candidates because it is not possible to predict the strain that may be responsible for the next pandemic with today's technology. A broadly cross-protective vaccine would be ideal for stockpiling in that it could be administered during the first wave of the pandemic while waiting for manuf
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SOURCE Novavax, Inc.
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