Describe approval process of Vaccine.

The approval process for vaccines is a rigorous and multifaceted procedure that involves several stages to ensure their safety, efficacy, and quality. This process typically includes the following steps:

1. Preclinical Testing: Before a vaccine can be tested on humans, it undergoes extensive preclinical testing in laboratories and on animals to assess its safety and potential efficacy. Researchers examine the vaccine's ability to stimulate ____ ______ ___ _______ ________.
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