Pfizer Inc. and BioNTech SE signed a letter of intent with The Biovac Institute, a Cape Town-based, South African biopharmaceutical company, to manufacture the Pfizer-BioNTech COVID-19 vaccine for distribution within the African Union.   Biovac will perform manufacturing and distribution activities within Pfizer’s and BioNTech’s global COVID-19 vaccine supply chain and manufacturing network, which will now span three continents and include more than 20 manufacturing facilities. To facilitate B...