Study of COVID-19 (Clinical Trail)

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 Vaccines and Trials

A vaccine trial is a clinical trial that aims at establishing the safety and efficacy of a vaccine prior to it being licensed. A vaccine candidate drug is first identified through pre-clinical evaluations that could involve high throughput screening and selecting the proper antigen to invoke an immune response.

Clinical development is a three-phase process. During Phase I, small groups of people receive the trial vaccine. In Phase II, the clinical study is expanded and the vaccine is given to people who have characteristics (such as age and physical health) similar to those for whom the new vaccine is intended. In Phase III, the vaccine is given to thousands of people and tested for efficacy and safety. Many vaccines undergo Phase IV formal, ongoing studies after the vaccine is approved and licensed.

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