Performs work requiring professional knowledge of microbiology. Includes: (1) work with protozoa, bacteria, algae, fungi, viruses, rickettsiae, microscopic parasites and similar microscopic and submicroscopic forms; (2) work in such fields as immunology, medical parasitology, physiology, serology, genetics, taxonomy, and cytology as they relate to microorganisms; (3) studies of the form, structure, reproductive processes, genetics, taxonomy, and cytology as they relate to microorganisms and products of their chemical activities; (4) studies of distribution of microorganisms in natural and manmade environments, their reaction to physical and chemical factors in the environment, their role as pathogenic and immunizing agents, and their isolation, cultivation, identification, and systematic classification; and (5) work that involves development of scientific microbiological methods, procedures, and techniques, and production and use of microorganisms in agricultural, industrial, medical, sanitary, and other practical applications.