Biden Promises 100 Million Vaccine Shots in 100 Days, but Shortage Worries Rise December 9, 2020 Auto Bot AstraZeneca PLC, Biden, Joseph R Jr, Coronavirus (2019-nCoV), Pfizer Inc, Presidential Transition (US), Trump, Donald J, United States Politics and Government, Vaccination and Immunization 0 President-elect Joseph R. Biden Jr.’s promise to shift the course of the pandemic in his first 100 days in office could run into vaccine production and procurement problems he will inherit.