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Human Challenge Studies for Vaccine Development: Regulatory Aspects of Human Challenge Studies
Introduction The traditional regulatory pathway for the evaluation of new vaccine candidates generally proceeds from preclinical through three successive phases of human trials. Study phases may overlap, and the clinical testing may be highly iterative because multiple Phase 1 or 2 trials may need to…

AstraZeneca’s Trial Is on Hold. It’s a Sign that the Science Is Working
Everyone awaiting a vaccine against Covid-19 must understand this fact: Bad outcomes may happen in vaccine trials. The good news is the U.S. Food and Drug Administration evaluates these outcomes before approving a vaccine. The purpose of clinical trials is to discover what can go wrong with a vaccine…