As Rollout Falters, Scientists Debate New Vaccination Tactics

Should second doses be delayed? Should most adults receive half-doses? Scientists are pondering ways to get more shots into more arms.Read MoreClinical Trials, Vaccination and Immunization, Coronavirus (2019-nCoV), Immune System, Public-Private Sector Cooperation, AstraZeneca PLC, Food and Drug Administration, Pfizer Inc, Great Britain, United States, Marks, Peter, Wachter, Robert MNYT > U.S. News