A healthcare worker fills a syringe with a dose of the Pfizer-BioNTech Covid-19 vaccine at The University Hospital of La Samaritana in Zipaquira, Colombia, February 18, 2021. Bloomberg
A healthcare worker fills a syringe with a dose of the Pfizer-BioNTech Covid-19 vaccine at The University Hospital of La Samaritana in Zipaquira, Colombia, February 18, 2021. Bloomberg

Biden to announce release of $4 billion for global vaccine effort