Which of these is NOT a feature of Helicobacter pylori?

Helicobacter pylori is a gram-negative bacterium, which means it has a thin peptidoglycan layer and an outer membrane containing lipopolysaccharides. This characteristic distinguishes it from gram-positive bacteria that have a thick peptidoglycan layer and lack an outer membrane. The classification as gram-negative is critical because it influences both the bacterium's structure and pathogenicity, including its resistance to certain antibiotics.

In addition to being gram-negative, H. pylori is a curved bacillus, flagellated, and produces urease, which enables it to survive in the acidic environment of the stomach. The presence of flagella aids in its motility, allowing it to colonize the gastric epithelium. Urease production is particularly significant as it helps to neutralize stomach acid, creating a more favorable environment for the bacteria.

Understanding these characteristics is essential for recognizing how H. pylori contributes to gastric diseases, such as peptic ulcers and gastric cancer.