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Re:The first human trial in Europe of a coronavirus vaccine ... by s1artibartfast on Friday April 24, 2020 @01:36AM (#22964979)
They exist, but are usually not sufficient to support a drug or vaccine approval.

The standard is two well controlled studies, but additional open label trials may be used to address specific health authority concerns.

If you are interested, you can look up the other trials the drug may have gone through.

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