<P> An enterotype is a classification of living organisms based on its bacteriological ecosystem in the human gut microbiome not dictated by age, gender, body weight, or national divisions . There are indications that long - term diet influences enterotype . Three human enterotypes have been proposed, but their value has been questioned . </P> <P> Due to the high acidity of the stomach, most microorganisms cannot survive there . The main bacterial inhabitants of the stomach include: Streptococcus, Staphylococcus, Lactobacillus, Peptostreptococcus, and types of yeast . Helicobacter pylori is a Gram - negative spiral organism that establishes on gastric mucosa causing chronic gastritis and peptic ulcer disease and is a carcinogen for gastric cancer . </P> <Table> <Tr> <Td_colspan="2"> Bacteria commonly found in the human colon </Td> </Tr> <Tr> <Th> Bacterium </Th> <Th> Incidence (%) </Th> </Tr> <Tr> <Td> Bacteroides fragilis </Td> <Td> 100 </Td> </Tr> <Tr> <Td> Bacteroides melaninogenicus </Td> <Td> 100 </Td> </Tr> <Tr> <Td> Bacteroides oralis </Td> <Td> 100 </Td> </Tr> <Tr> <Td> Enterococcus faecalis </Td> <Td> 100 </Td> </Tr> <Tr> <Td> Escherichia coli </Td> <Td> 100 </Td> </Tr> <Tr> <Td> Enterobacter sp . </Td> <Td> 40--80 </Td> </Tr> <Tr> <Td> Klebsiella sp . </Td> <Td> 40--80 </Td> </Tr> <Tr> <Td> Bifidobacterium bifidum </Td> <Td> 30--70 </Td> </Tr> <Tr> <Td> Staphylococcus aureus </Td> <Td> 30--50 </Td> </Tr> <Tr> <Td> Lactobacillus </Td> <Td> 20--60 </Td> </Tr> <Tr> <Td> Clostridium perfringens </Td> <Td> 25--35 </Td> </Tr> <Tr> <Td> Proteus mirabilis </Td> <Td> 5--55 </Td> </Tr> <Tr> <Td> Clostridium tetani </Td> <Td> 1--35 </Td> </Tr> <Tr> <Td> Clostridium septicum </Td> <Td> 5--25 </Td> </Tr> <Tr> <Td> Pseudomonas aeruginosa </Td> <Td> 3--11 </Td> </Tr> <Tr> <Td> Salmonella enterica </Td> <Td> 3--7 </Td> </Tr> <Tr> <Td> Faecalibacterium prausnitzii </Td> <Td>? common </Td> </Tr> <Tr> <Td> Peptostreptococcus sp . </Td> <Td>? common </Td> </Tr> <Tr> <Td> Peptococcus sp . </Td> <Td>? common </Td> </Tr> </Table> <Tr> <Td_colspan="2"> Bacteria commonly found in the human colon </Td> </Tr>

What kind of bacteria lives in our intestines
find me the text answering this question