H. pylori infections occur across the world due to exposure to saliva or stool in contaminated water or food. Learn how the bacterium is spread and treated with antibiotics. Overview What is an H. pylori infection? H. pylori (Helicobacter pylori) is a type of bacteria that infects your stomach. It’s the most common chronic bacterial infection in humans. It affects more than half of the world’s population. But it doesn’t cause illness in most people. H. pylori (Heliobacter pylori) is a type of bacteria that infects your stomach. It can damage the tissue in your stomach and the first part of your small intestine (the duodenum). In some cases it can also cause painful sores called peptic ulcers in your upper digestive tract. H. pylori is a common bacteria that may cause pain and increase the risk of ulcers or stomach cancer. Learn about symptoms, complications, and more. H. pylori (Helicobacter pylori) is a type of bacteria that infects your stomach and small intestine. These bacteria damage the lining of your stomach over time, which can lead to irritation, gastritis or peptic ulcers. Helicobacter pylori (H. pylori) is a type of bacteria that can cause an infection in your stomach. If you develop an H. pylori infection, you may not have any signs or symptoms. But it can lead. Helicobacter pylori, previously known as Campylobacter pylori, is a gram-negative bacterium best known for its role in infecting the human stomach, often causing gastric ulcers and sometimes stomach cancer. If you're concerned about an H. pylori infection, talk with your healthcare professional. Together you can decide whether H. pylori testing might be right for you. H. pylori infections are caused by H. pylori germs that get into the stomach lining. The germs appear to be passed from person to person through contact with saliva, vomit or stool. They also may be spread through contaminated surfaces, or tainted food or water. Helicobacter pylori (H. pylori) is a type of bacteria that infects your stomach. It can cause sores and inflammation in the lining of your stomach or the upper part of your small intestine (the.