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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H. pylori is a bacteria that infects the stomach and small intestine and is the major cause of stomach and duodenal ulcers. Symptoms of H. pylori infection include frequent burping, bloating, nausea and vomiting, abdominal pain and weight loss. H. pylori infection can cause ulcers, gastritis and stomach cancer. It is diagnosed by a blood, breath or stool test.