"These results complete GSK's first line results across key age groups. As previously shown in young children and adults under 60 years of age, these new data demonstrate the ability of the vaccine to induce a high immune response considered indicative of protection after one dose across a wide range of ages, including the elderly." said JÃ©an Stephenne, President of GSK Biologicals. "These data are very important for those in government who need to continually assess new data in light of the current global public health challenge."
The trial, which is taking place in Belgium, involves 240 adults aged 18 to 85 years, and was designed to evaluate the tolerability and immunogenicity of Pandemrix. Half of the subjects enrolled in the trial (120 subjects) were under 60 and the other half were over 60 years of age. A planned analysis was performed 21 days after the first dose, immediately prior to administration of the second dose.
These results show that 88.0% of the subjects between 61-70 years of age, and 86.7% of those over 70 years of age, demonstrated a response that was above the regulatory threshold of 1:40 seroprotection, which is considered indicative of protection. Results in the age group 18 - 60 years of age were similar to previously reported studies in that age group, with 97.5% of subjects reaching the 1:40 seroprotection level in this trial.
The tolerability of the vaccine in this study was shown to be similar to that observed in the previously EMEA approved H5N1 adjuvanted vaccine. Local reactions such as pain, redness, and swelling at the site of injection were observed, but no severe reactions were reported to date. General reactions such as low grade fever, headache, and muscle ache were also observed, and were in line, or slightly more often than observed with GSK's current unadjuvanted seasonal influenza vaccines. Regulatory authorities will review these data and then may consider changes to the label, which currently indicates a two dose schedule for all age groups.
Further information on GSK's development of a vaccine to protect against pandemic 2009, including explanation of the vaccine development process and background information on adjuvants is available on: http://www.gsk.com/media/pandemic-flu.htm
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