Influenza Clinical Trial
Official title:
Phase 2 Observer-Blind, Randomized Trial to Evaluate the Immunogenicity and Safety of PanBlok at Three Dose Levels Adjuvanted With a Stable Oil-in-Water Emulsion Compared With PanBlok Without Adjuvant in Healthy Adults Aged 18 to 49 Years
The purpose of this study is to investigate the safety and immunogenicity of a recombinant hemagglutinin (rHA) influenza vaccine derived from A/Indonesia/05/2005 (H5N1) administered at 3 dose levels in adjuvanted (SE) rHA formulations and 1 dose levels in an un-adjuvanted rHA formulation.
All currently licensed influenza vaccines in the United States are produced in embryonated
hen's eggs. There are several well-recognized disadvantages to the use of eggs as the
substrate for influenza vaccine. Eggs require specialized manufacturing facilities and could
be difficult to scale up rapidly in response to an emerging need such as a pandemic. It is
usually necessary to adapt candidate vaccine viruses for high-yield growth in eggs, a
process that can be time consuming, is not always successful, and can select receptor
variants that may have suboptimal immunogenicity. In addition, agricultural diseases that
affect chicken flocks, and that might be an important issue in a pandemic due to an avian
influenza virus strain, could easily disrupt the supply of eggs for vaccine manufacturing.
Therefore, development of alternative substrates for influenza vaccine production has been
identified as a high-priority objective.
One potential alternative method for production of influenza vaccine is expression of the
influenza virus hemagglutinin (HA) using recombinant DNA techniques. This alternative avoids
dependence on eggs and is very efficient because of the high levels of protein expression
under the control of the baculovirus polyhedrin promoter.
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Allocation: Randomized, Endpoint Classification: Safety Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor), Primary Purpose: Prevention
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