FILE PHOTO: A test tube labeled with the vaccine is seen in front of AstraZeneca logo in this illustration taken, September 9, 2020. REUTERS/Dado Ruvic/File Photo
CHICAGO (Reuters) - A top U.S. scientist overseeing COVID-19 vaccine trials expects a large U.S. study to determine how effective AstraZeneca's experimental inoculation is, following perplexing results from other trials released by the company and partner Oxford University.
AstraZeneca Plc is one of the leading vaccine developers, but interim data released Nov. 23 from trials in Britain and Brazil showed a vastly divergent performance when the vaccine was tested in two different dose combinations.
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