Helical bacteria are a type of bacteria characterized by their spiral or corkscrew shape. This unique morphology allows them to move in a distinctive manner, often using a rotating motion. They belong to various genera, including Spirochaeta and Treponema, and can be found in diverse environments, such as soil, water, and the human body. Some helical bacteria are known to be pathogenic, meaning they can cause diseases in humans and animals. For example, Treponema pallidum is the bacterium responsible for syphilis, while Borrelia burgdorferi is associated with Lyme disease. Understanding these bacteria is important for public health and disease prevention.