Bacteriology
The science and study of bacteria and their relation to medicine and to other areas such as agriculture (e.g., farm animals) and industry.
Bacteria are single-celled microorganisms which can live as independent organisms or, dependently, as parasites.
Among the better known bacteria are strep, staph, and the agents of tuberculosis and leprosy.
Bacteriology is a part of microbiology which encompasses the study of bacteria, viruses, and all other sorts of microorganisms.