Oxford-AstraZeneca Vaccine: Why the Uncertainty?
The preliminary results from phase III trials of COVID-19 vaccines have been reported in the media. The vaccine developed and trialled by Pfizer and BioNTech is reported to be 95% effective and Moderna's is 94.5% effective. Trial results of the vaccine being developed by Oxford University and AstraZeneca show that it is 70% effective, but "with potential for that to rise to 90 per cent". In this blog we explore the reasons and implications of this uncertainty.
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