How do vaccines get tested for safety before they are approved?
Quick Answer
They go through laboratory studies, animal testing and phased human trials. Each phase is designed to check safety, dose and how well the vaccine works.
The Full Story
Before approval, a vaccine is studied in preclinical research and then in phased clinical trials. Phase 1 focuses mainly on safety and dosage in a small group, phase 2 looks more closely at immune response and side effects, and phase 3 involves thousands or tens of thousands of people to measure protection and rarer adverse events. Regulators review the data before licensing, and monitoring continues after approval through pharmacovigilance systems. This process is why vaccine development is rigorous even when it is fast.
Key Facts
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