<prompt> Which of the following is false regarding H pylori ?With chronic infection urease breath test become negativeH. pylori infection remains life long if untreatedEndoscopy is diagnosticToxigenic strains usually cause ulcer  <response>: Ans. is a i.e., With chronic infection urease breath test become negative . Urea breath test is the most consistently accurate test for diagnosis of H. Pylori infection. . It is useful for follow-up after treatment, as it becomes negative after treatment. . In chronic infection it remains positive. About other options . Most H. pylori - colonized person do not develop clinical sequelae. They may carry infection life long. . Endoscopic culture is the most specific test. . Ulcer is caused by strains carrying vacuolating cytotoxin gene. 