Optimistic knowledge on BioNTech and U.S. accomplice Pfizer Inc's COVID-19 vaccine is an unlikely success for the married couple behind the German biotech agency, who’ve devoted their lives to harnessing the immune system towards most cancers. Pfizer mentioned on Monday mentioned its experimental vaccine was greater than 90% efficient in stopping COVID-19 primarily based on preliminary knowledge from a big research. Pfizer and BioNTech are the primary drugmakers to point out profitable knowledge from a large-scale medical trial of a coronavirus vaccine.