EXPLAINER: Should vaccine volunteers now get the real thing? – KOB

HOW VACCINE STUDIES WORK
New drugs, vaccines or treatments usually go through rigorous tests and evaluations before reaching regulators for approval.
For vaccines, researchers compare what happens when a large group of volunteers gets the shots, versus what happens to another large group that doesn’t. They compare side effects in each group. And they measure the vaccine’s effectiveness by looking at how many in each group pick up infections.
To do this fairly, researchers randomly assign participants…

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