Oxford Covid vaccine hit 90% success rate thanks to dosing error

Oxford Covid vaccine hit 90% success rate thanks to dosing error

Participants given first shot at half strength by mistake were found to be better protected

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The Oxford University and AstraZeneca vaccine trials reached 90% efficacy by accident thanks to the “serendipity” of an error that led to some participants receiving half doses, it has emerged.

On Monday scientists revealed that the Oxford vaccine had an overall efficacy of 70%, but could be around 90% effective when administered as a half dose followed by a full dose a month later.

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November 24, 2020 at 01:29AM