Helicobacter pylori are spiral-curved, gram-negative bacteria that is present on surface epithelium of the mucous layer of the stomach. Immunohistochemical techniques using a Helicobacter pylori antibody can distinguish it from other types of curved bacteria.There is evidence showing that these bacteria may play a significant role in peptic ulcer disease. A study has suggested that Helicobacter pylori infection is a risk factor for colorectal polyps in children. The small spiral-curved shaped bacterium can be seen clearly using a 100X oil objective under the microscope.z
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