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Pharmaceutical company AstraZeneca and Oxford University have acknowledged an error in their phase three trial.
While most of the volunteers got the correct dose for both of their two shots, not all did.
Regulators agreed that the trial could continue after being informed, and the error had no effect on vaccine safety.
The outcome is likely to see a start of a new trial in the US for more data to assure preliminary results of their COVID-19 vaccine is suitable for regulators including the Medicines and Healthcare Products Regulatory Agency and the Food and Drug Administration.
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