AstraZeneca is likely to conduct an additional global trial to assess the efficacy of its Covid-19 vaccine, according CEO Pascal Soriot, after current studies raised questions over its level of protection.

The new trial would be run instead of adding an arm to an ongoing US trial and would evaluate a lower dosage that performed better than a full amount in Astra’s studies. The company’s acknowledgment that the lower level was given in error fuelled concerns, and the new trial would be used to confirm whether the higher 90% efficacy rate stands...

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