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Bacteria found in human digestive system, computer illustration. The bacteria are: Helicobacter pylori, Enterococcus faecalis, Lactobacillus spp. and Bifidobacterium spp. Lactobacillus and Bifidobacterium are normal flora and have beneficial functions, such as synthesis of vitamins and protection against pathogens. H. pylori is associated with stomach and duodenal ulcers and gastric cancer. E. faecalis can cause inflammation outside of the intestines, including endocarditis and pyelonephritis.