COVID-19: Phase III Trial

Wed 16 Dec, 2020 05:22 pm
Why did the health authorities need to delay the roll-out of the COVID vaccine pending the completion of Phase III trials?

Phase III trials are to ascertain vaccine effectiveness. Safety was demonstrated in Phase I and in Phase II.

During a pandemic, why not try a safe vaccine even though it might not be effective?
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Wed 16 Dec, 2020 06:11 pm
Isn't that what they started on Monday.
Wed 16 Dec, 2020 06:29 pm
Giving everyone a shot of distilled water would not do to improve health, encourage risky behavior and diminish faith in vaccines.
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Wed 16 Dec, 2020 06:31 pm

Yes, but I think the authorities waited until the Phase III trials were concluded.
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