When early results from the final trials began to roll in, scientists were well prepared. Now, they face the logistical challenge of putting the vaccine to work
A volunteer undergoes testing in Oxford, England, as part of a vaccine trial by AstraZeneca and the University of Oxford on Nov. 19, 2020. AstraZeneca’s vaccine, which is cheaper and easier to store than Pfizer’s, is also being vetted for emergency approval in Britain; Image: Andrew Testa/The New York Times
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