The vaccine-maker slightly downgrades its efficacy rate as it awaits US regulatory approval.
from BBC News - World https://ift.tt/3reWFOg
from BBC News - World https://ift.tt/3reWFOg
Covid vaccine: AstraZeneca amends US vaccine efficacy results
![Covid vaccine: AstraZeneca amends US vaccine efficacy results]()
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March 25, 2021
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