Final answer:
Louis Pasteur is considered the father of microbiology due to his contributions to the understanding of microorganisms and their role in fermentation, food spoilage, and disease. He developed pasteurization and vaccines for diseases like anthrax and rabies.
Step-by-step explanation:
Louis Pasteur is considered the father of microbiology because of his significant contributions to the field. Although he did not discover microorganisms, he conducted important experiments and provided evidence to support the theory that microorganisms cause fermentation, food spoilage, and certain diseases. Pasteur also developed techniques like pasteurization to make food safe and vaccines for diseases like anthrax and rabies.