Spirochetes are a group of bacteria characterized by their unique spiral shape and flexible structure. They are typically found in various environments, including soil, water, and the intestines of animals. Some species are known to be pathogenic, meaning they can cause diseases in humans and animals. One well-known example of a pathogenic spirochete is Treponema pallidum, which is responsible for syphilis. Another notable spirochete is Borrelia burgdorferi, the causative agent of Lyme disease. These bacteria move in a corkscrew motion, allowing them to navigate through viscous environments, such as mucus and tissue.