⚫ 𝑯𝒆𝒍𝒊𝒄𝒐𝒃𝒂𝒄𝒕𝒆𝒓 𝒑𝒚𝒍𝒐𝒓𝒊 (H. pylori) is a gram-negative, spiral-shaped bacterium that colonizes the stomach lining. It is a common cause of chronic gastritis and peptic ulcers and is associated with an increased risk of gastric cancer and mucosa-associated lymphoid tissue (MALT) lymphoma.