A vaccine trial, also known as a vaccine clinical trial, is a research study designed to evaluate the safety and efficacy of a vaccine in humans. These trials are a critical part of the process of developing vaccines to ensure they are safe and effective before widespread use. Vaccine trials typically occur in several phases, each with specific objectives: 1. **Phase 1 trials**: These involve a small group of healthy volunteers to assess the vaccine's safety, determine appropriate dosage, and identify any side effects.
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