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Rabies, one of the most fatal diseases, has existed in history for long enough to appear in Greek mythology. Louis Pasteur (1822–1895), regarded as the `father of microbiology,` is credited to the remarkable breakthrough of developing a vaccine against rabies. Korea Post is issuing the commemorative stamp 200th Anniversary of the Birth of Louis Pasteur in his honor. Louis Pasteur was born in 1822 in Dole. Pasteur decided to study chemistry after attending lectures of Jean-Baptiste Dumas, the greatest chemist of the time. In 1848, Pasteur became famous at the young age of 26 by distinguishing two different types of crystals of tartaric acid, which was a contemporary assignment among fellow chemists. Observing the principles of wine fermentation in crystallography research, he naturally expanded his interest in microbiology. At that point, Pasteur showed that microorganisms are not naturally produced but come from the outside through an experiment using swan neck flasks. Pasteur`s contributions to bacteriology and microbiology led to the development of sterilization and hygiene, applying the results of his research to treatment and medical operations. His discovery that microorganisms cause diseases made him put efforts to prevent diseases as well, leading to successfully immunising chickens against fowl cholera and developing a vaccine for anthrax. Pasteur prioritized his focus on rabies, a disease that is fatal not only to humans but also to animals, and immersed himself in developing a vaccine. In 1884, he carried out a successful experiment of a rabies vaccine targeting dogs. He succeeded with his human trial in 1885, and his achievement in rabies research became widely known around the world. After a series of successful vaccine experiments, people raised funds to set up a laboratory for Pasteur. Established in 1888 in Paris, the Institut Pasteur has become a global research institute that has produced ten Nobel laureates. Today, 33 institutes in 25 countries are part of the Pasteur Network, which endeavors in studies on infectious diseases for the public health of global communities. One of the affiliated institutes is Institut Pasteur Korea, which is located in Pangyo, Gyeonggi-do. The commemorative stamp features Louis Pasteur and his microscope, and on the margin of the printed sheet are Pasteur`s laboratory instruments, including swan neck flasks. We hope this commemorative stamp serves as an opportunity to appreciate the achievements of Pasteur, whose contributions to microbiology through ceaseless experiments led to the development of the rabies vaccine.