GlaxoSmithKline and Sanofi Pasteur vaccine delayed until late 2021 From CNN's Martin Goillandeau in London An employee works at a GlaxoSmithKline factory in Saint-Amand-les-Eaux, France, on December 3, where the adjuvant for Covid-19 vaccines will be manufactured. Francois Lo Presti/AFP/Getty Images British and French pharmaceutical giants GlaxoSmithKline and Sanofi Pasteur said Friday the release of their coronavirus vaccine would be delayed until late 2021 after interim results showed “insufficient immune response” in the elderly. “Insufficient response in older adults demonstrates the need to refine the concentration of antigen in order to provide high-level immune response across all age groups,” a joint press release on their websites read.