New questions about the Oxford-AstraZeneca vaccine

The World

There was jubilation at the start of the week when Oxford University announced the results from phase three of their vaccine trials. The new vaccine, the university said, offers a high level of protection against COVID-19. But since then, scientists in the UK and the US have been asking questions — and some are worried that the drug may not be as effective as hoped. The World's Orla Barry reports from London.

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