Vaccine trial

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A vaccine trial is a clinical trial that aims at establishing the safety and efficacy of a vaccine prior to it being licensed.^[1]

A vaccine candidate drug is first identified through preclinical evaluations that could involve high throughput screening and selecting the proper antigen to invoke an immune response.^{[citation needed]}

Some vaccine trials may take months or years to complete, depending on the time required for the subjects to react to the vaccine and develop the required antibodies.^{[citation needed]}