H. pylori true about -
Gram +ve spiral organism
It is a protozoa
Causes chronic gastritis in adults due to re-infection
Treatment causes regression of gastric lymphoma
Ans. is 'd' i.e., Treatment causes regression of gastric lymphoma "Infection of the stomach by the bacterium helicobacter pylori induces the development of gastric MALT (mucosa -associated lymphoid tissue) lymphomas. This association is suppoed by evidence that patients treated with antibiotics to eradicate H. pylori have regression of their MALT lymphoma". About other options . H pylori is a gram negative (not gram positive) spiral bacillus. . It is a bacteria not protozoa. . H. pylori colonization induces chronic superficial gastritis. It is due to primary colonization, not reinfection. After eradication, reinfection rate causing chronic gastritis is less than .5% per year. . It causes mucosal damage of duodenum due to increased gastric acid secretion, which induces protective gastric metaplasia in the duodenum. The duodenum becomes inflammed and then ulcerated.