Nation Sanofi, GSK say vaccine shows 100% efficacy against hospitalization from severe disease: Live COVID updates February 24, 2022February 24, 2022 Jeanine Santucci and John Bacon, USA TODAY Comments Off on Sanofi, GSK say vaccine shows 100% efficacy against hospitalization from severe disease: Live COVID updates Sanofi and GSK seek approval for a vaccine they say shows 100% efficacy against hospitalization from severe disease. Latest COVID news.