Helicobacter pylori is a Gram-negative, microaerophilic bacterium that can inhabit various areas of the stomach, particularly the antrum. It causes a chronic low-level inflammation of the stomach lining and is strongly linked to the development of duodenal and gastric ulcers and stomach cancer. Over 80 % of individuals infected with the bacterium are asymptomatic. Description: ATCC strain whole cell sonicate. Alternative Names: H. pylori protein