Helicobacter Pylori is a bacterium (germ) that can infect the human stomach. The bacterium lives in the lining of the stomach, and the chemicals it produces causes inflammation of the stomach lining. Infection appears to be life long unless treated with medications to eradicate the bacterium. This fact sheet provides important information regarding the causes, spread and prevention of H. pylori infection and talks about the diagnosis, tests and possible treatment options available.