What type of bacteria is Helicobacter pylori?

Helicobacter pylori is classified as a Gram-negative spiral rod. This bacterium is characterized by its spiral shape, which is significant for its motility and ability to navigate through the acidic environment of the stomach. The Gram-negative classification indicates that it has a thin peptidoglycan layer surrounded by an outer membrane, which plays a crucial role in its pathogenicity and resistance to certain antibiotics.

This bacterium is most famously associated with causing chronic gastritis and peptic ulcers, and its unique spiral form helps it to colonize the gastric mucosa effectively. The Gram-negative aspect is also important as it influences the approach to disinfection and sterilization in clinical settings due to its resistant nature compared to Gram-positive organisms.