Why Biden Inherited a Covid-19 Vaccine Supply Unlikely to Grow Before April January 21, 2021 Auto Bot Coronavirus (2019-nCoV), Pfizer Inc, United States Politics and Government, Vaccination and Immunization, your-feed-healthcare 0 But with 200 million doses pledged for the first quarter of the year, some experts say President Biden’s plan for 100 million shots in 100 days is far too modest.