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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Plus, H. pylori bacteria is often at the root of other major digestive problems, like peptic ulcers and gastritis. (2, 3) So, not only can H. pylori cause stomach ulcers, it can also cause ulcers in your esophagus or small intestine. Youâre probably wondering how do you get H. pylori if itâs such a common infection?