Behind Pfizer's vaccine, an understated husband-and-wife 'dream team'

Positive data on BioNTech and U.S. partner Pfizer Inc’s COVID-19 vaccine is an unlikely success for the married couple behind the German biotech firm, who have devoted their lives to harnessing the immune system against cancer.Pfizer said on Monday said its experimental vaccine was more than 90% effective in preventing COVID-19 based on initial data from a large study