COVID-19 Q&A: Sanford Research on clinical trials, vaccines - Sanford  Health News

The phase 4 trial is also referred to as post-marketing surveillance, it is conducted after the drug is already marketed and is available to the general public. The main objective of the phase 4 trial is to check the performance of the drug in real-life scenarios, to study the long-term risks and benefits of using the drug, and to discover any rare side effects. As of April 25, 2021 there are 4 vaccines in this phase.


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Non-Replicating Viral Vector

Replicating Viral Vector

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Protein Subunit



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