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Covid-19 vaccine: AstraZeneca faces questions about its success rate

FILE PHOTO: A test tube labelled with the vaccine is seen in front of AstraZeneca logo in this illustration taken, September 9, 2020. [Reuters]

Days after grabbing headlines with its Covid-19 “vaccine for the world”, AstraZeneca is facing tricky questions about its success rate that some experts say could hinder its chances of getting the speedy US and EU regulatory approval.

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