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The approval process of a vaccine in the field of Drugs Regulatory Affairs is a highly systematic and rigorous procedure designed to ensure the safety, efficacy, and quality of the product before it reaches the population. Vaccines differ from conventional drugs because they are administered to healthy individuals, often on a large scale, which makes the regulatory scrutiny more stringent. The process typically begins with the preclinical stage and progresses through multiple phases of clinical trials, regulatory review, and post-marketing surveillance. The development starts with the preclinical stage, where laboratory ______ ___ ___ _________ _________ ______ _____ ___ __________ _______ ______ __________.
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