Spiral bacteria, also known as spirilla, are a type of bacteria characterized by their helical or corkscrew shape. This unique structure allows them to move in a twisting motion, which can help them navigate through liquids. They are often found in various environments, including soil and water, and can play important roles in ecosystems. Some spiral bacteria are pathogenic, meaning they can cause diseases in humans and animals. For example, Helicobacter pylori is a spiral bacterium linked to stomach ulcers and other gastrointestinal issues. Understanding these bacteria is crucial for both environmental science and medicine.