The cells of the adaptive immune system are special types of leukocytes, called lymphocytes. B cells and T cells are the major types of lymphocytes and are derived from hematopoietic stem cells in the bone marrow.
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As mentioned, it is the underlying cause of most duodenal and stomach ulcers and some cases of gastritis, duodenitis and non-ulcer dyspepsia. Various tests can detect H. pylori and your doctor may suggest one: A breath test can confirm that you have a current H. pylori infection.