On Sept. 3, 2020, Sanofi and GSK announced the start of the Phase 1/2 clinical trial for their adjuvanted COVID-19 vaccine.

The vaccine candidate, developed in partnership by Sanofi and GSK, uses the same recombinant protein-based technology as one of Sanofi’s seasonal influenza vaccines with GSK’s established pandemic adjuvant technology.

In July 2020, Sanofi and GSK announced a collaborative effort with the U.S. government to supply up to 100 million doses of their COVID-19 recombinant protein-based vaccine to meet the U.S. government’s Operation Warp Speed goal of making hundreds of millions of doses of safe and effective COVID-19 vaccines available in the United States as quickly as possible.