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Vaccine development is the process of creating vaccines to prevent infectious diseases. Vaccines stimulate the immune system to recognize and mount a protective response against specific pathogens. Vaccine development typically involves several stages, including preclinical testing, clinical trials, and regulatory approval. Advances in vaccine development have led to the development of effective vaccines for many diseases, including measles, polio, and influenza. Ongoing research in vaccine development is focused on the development of new and improved vaccines for emerging and reemerging infectious diseases, as well as for other conditions, such as cancer.