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Helicobacter pylori (H. pylori), a curved bacillus, colonizes the upper gastrointestinal tract and has been shown to be the causative agent for most cases of chronic gastritis, duodenitis, and ulcers. H. pylori is also associated with gastric carcinoma. IgG antibodies reactive to H. pylori are measured in the patient's serum sample by a solid phase two step chemiluminescent immunoassay. Patient treatment with antibiotics prescribed by their physician to eliminate H. pylori has been shown to result in a decrease of intestinal inflammation along with healing of the intestinal mucosa.