Microbiology encompasses numerous sub-disciplines including virology, bacteriology, protistology, mycology, immunology and parasitology. Old ideas of infectious disease epidemiology were gradually replaced by advances in bacteriology and virology. In general, the study of prokaryotes falls under the field of bacteriology rather than parasitology. The study of bacteria is known as bacteriology, a branch of microbiology. The college began with departments of anatomy, physiology, biochemistry and bacteriology. He is one of the founders of modern bacteriology and microbiology. The facilities included chemical, physiology, and bacteriology experimental treatment laboratories. Colwell holds degrees in bacteriology, genetics, and oceanography and studies infectious diseases. He wrote many articles on bacteriology, immunology, and chemotherapy. Noel progressed through his studies, having studied pathology and bacteriology. Ferdinand Cohn is said to be a founder of bacteriology, studying bacteria from 1870. Professor Isak Borg is a widowed 78-year-old physician who specialized in bacteriology. In the early 1890s, Haffkine shifted his attention to studies in practical bacteriology. W. Russell Byrne worked in the bacteriology division of the Fort Detrick research facility. These referred to samples taken for culture and sensitivity (bacteriology) tests.