Genus Spirillum is a type of bacteria that is sometimes referred to as a spiral-shaped microorganism. Other synonyms for Genus Spirillum include spiral bacteria, spirillum-shaped bacteria, and helically-shaped bacteria. These terms are used to describe the physical characteristics of the bacteria, which are typically long and thin with a corkscrew-like shape. Genus Spirillum is commonly found in natural environments such as freshwater and soil, but some species can also be found in the gastrointestinal tract of animals. Despite their small size, some species of Genus Spirillum can be pathogenic and cause diseases in both humans and animals.