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The Third European Influenza Conference (ESWI) held at Vilamoura Portugal announced that Prepandrix™, GlaxoSmithKline’s (GSK) H5N1 adjuvanted pre-pandemic influenza vaccine, confers broad cross-clade immunity that is maintained when the second dose is given many months after the first dose, and even if the second dose is formulated from a different H5N1 strain. Greater administration flexibility, adaptable to local pre-pandemic vaccination policies, could potentially reduce the impact on vital healthcare resources during the first intensive months of a pandemic.
"When indeed H5N1 would be at the basis of the next influenza pandemic, it is critical that a pre-pandemic H5N1 influenza vaccine provides broad and persistent immunity, also against drifted H5N1 strains." said Professor Albert Osterhaus, Head Department of Virology, Institute of Virology Erasmus Medical Centre Rotterdam. "GSK’s pre-pandemic influenza vaccine has repeatedly demonstrated and now confirmed that this level of immunity can be maintained when the second dose is given many months after the first, even with a different H5N1 strain."
The World Health Organization (WHO) considers that the world is now closer to another influenza pandemic than at any time since the last one in 1968,1 with the virus currently threatening to trigger a pandemic (H5N1) having a potential reported case fatality rate above 60%.2 The WHO has highlighted that vaccines are the most important intervention for preventing influenza and reducing its health consequences during a pandemic1.
A pre-pandemic influenza vaccine is the only vaccine which can be produced in advance and stockpiled today, allowing immediate availability in the event of a WHO declared pandemic. In contrast, a pandemic influenza vaccine can only go into production once the exact pandemic influenza strain is determined and declared, with the first doses being available a minimum of four months after the onset of a pandemic.2
The pre-pandemic influenza vaccine concept is based on using a currently circulating avian influenza virus likely to cause a pandemic, such as H5N1, to make a vaccine with the ability to raise immune protection against potential drift H5N1 strains. With experts citing immunisation with stockpiled pre-pandemic influenza vaccine as the most effective strategy for protecting entire populations,3,4 GSK’s pre-pandemic vaccine will play a critical role in pandemic preparedness planning.
"These new data show that GSK’s pre-pandemic influenza vaccine, is highly adaptable to local pandemic policies. Stockpiling of H5N1 vaccine and use of this vaccine is anticipated to provide the ability to offer protection to vaccinated individuals as well as to slow down the spread of the disease. New developments such as this make it vital for governments to continually evaluate their pandemic preparedness plans," said Jean Stéphenne, President and General Manager GSK Biologicals. "We are actively working with governments and other organisations across the world to ensure the most effective pre-pandemic influenza vaccine is available to help protect against an influenza pandemic."
