Experts discuss how rollout of COVID-19 vaccines could be improved Yuki Iwamura/AP CVS Pharmacist Gerard Diebner prepares a shot of the COVID-19 vaccine for the nursing home residents at Harlem Center for Nursing and Rehabilitation, a nursing home facility, on Friday, Jan. 15, 2021 in Harlem neighborhood of New York. (AP Photo/Yuki Iwamura) By: Scripps National and last updated 2021-01-22 16:40:51-05 Likely the biggest immediate challenge of the Biden administration is improving the vaccine rollout. His new COVID-19 team has said it aims to administer 100 million shots for 50 million Americans in the first 100 days of office. Itâs a plan some are still challenging