Biden pledges massive vaccine uptick as states struggle with confusion over dosage numbers

100 million shots planned during first 100 days in office

COVID-19 vaccine
One of four vials of the COVID-19 vaccine, right, sits next to a bottle of sodium chloride before it is reconstituted and ready to be administered to awaiting front line health care workers at UCHealth Poudre Valley Hospital on Dec. 14, 2020, in Fort Collins, Colorado. (Helen H. Richardson/The Denver Post, pool)