I don't know if there is a definite person, but the first person to invent a compound microscope was Dutch Hans Janssen and hism son Zacharias who saw cells. I am not sure about microorganisms unless to you this is the answer.
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Antonie van Leeuwenhoek, a Dutch scientist, is credited with discovering microorganisms in the 17th century. Using a simple microscope, he observed and described bacteria and other small organisms for the first time.
Louis Pasteur is credited with discovering the germ theory of disease, which established the link between microorganisms and disease. He conducted experiments to show that microorganisms are responsible for causing disease, and that medicines could be used to combat these harmful microorganisms.
Alexander Fleming discovered penicillin, Louis Pasteur discovered the principles of vaccination and pasteurization, and Anton Van Leeuwenhoek discovered the existence of microorganisms through his early microscope.
In 1857, Louis Pasteur discovered the concept of fermentation, showing that microorganisms could cause the spoilage of wine. This discovery laid the foundation for his later work in microbiology and developing pasteurization techniques.
Antonie van Leeuwenhoek is credited with discovering microorganisms in the 17th century. Using a microscope of his own design, he observed various tiny organisms, which he called animalcules, in samples of water and other substances. His work laid the foundation for the field of microbiology.
Anton discovered microorganisms, such as bacteria and yeast, using a simple microscope he made himself. This discovery laid the foundation for the field of microbiology.