Part 9/13:
Clinical trials proceed through multiple phases. In Phase 1, small groups evaluate safety and immune responses. Volunteers undergo physical assessments, and their blood samples are analyzed for antibody production.
Success in early trials paves the way for larger Phase 3 trials, involving tens of thousands of participants. These large-scale studies compare vaccinated and placebo groups to determine the vaccine's effectiveness in preventing COVID-19. This rigorous process ensures that only vaccines meeting high safety and efficacy standards are approved for widespread use.