A volunteer in Oxford, England, on Friday, Nov. 20, 2020, receives the coronavirus vaccine made by AstraZeneca and the University of Oxford. The drug maker AstraZeneca announced on Monday, Nov. 23, 2020, that an early analysis of some of its late-stage clinical trials showed that its coronavirus vaccine was 70.4% effective, on average, in preventing COVID-19. (Andrew Testa/The New York Times)
Connecticut hospitals preparing for a COVID-19 vaccine that could arrive next month are facing a host of unknowns
