This is better known as microbiology which is the study of small creatures and bacteria. Usually the scientist is looking at the cells of animals and plants. Scientists also look at viruses. Bacteriology is the study of bacteria, mycology is the study of fungi and virology is the study of viruses. Microbes can be helpful and not just harmful. Microbes produce different products that are used for food and vehicles. Microbiology began during ancient history in Jainism. It evolved during the medieval world and into the modern times. One famous microbiologist includes Louis Pasteur. He discovered pasteurization and cures for cholera and rabies.