Sanofi and GSK announce a delay in their adjuvanted recombinant protein-based COVID-19 vaccine program to improve immune response in older adults.
This decision was published on December 11, 2020, and was based on the Phase 1/2 study interim results which showed an immune response comparable to patients who recovered from COVID-19 in adults aged 18 to 49 years.
But, a low immune response in older adults, likely due to an insufficient concentration of the antigen, stated the companies.
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