<Tr> <Td> Peptostreptococcus sp . </Td> <Td>? common </Td> </Tr> <Tr> <Td> Peptococcus sp . </Td> <Td>? common </Td> </Tr> <P> The small intestine contains a trace amount of microorganisms due to the proximity and influence of the stomach . Gram - positive cocci and rod - shaped bacteria are the predominant microorganisms found in the small intestine . However, in the distal portion of the small intestine alkaline conditions support gram - negative bacteria of the Enterobacteriaceae . The bacterial flora of the small intestine aid in a wide range of intestinal functions . The bacterial flora provide regulatory signals that enable the development and utility of the gut . Overgrowth of bacteria in the small intestine can lead to intestinal failure . In addition the large intestine contains the largest bacterial ecosystem in the human body . About 99% of the large intestine and feces flora are made up of obligate anaerobes such as Bacteroides and Bifidobacterium . Factors that disrupt the microorganism population of the large intestine include antibiotics, stress, and parasites . </P> <P> Bacteria make up most of the flora in the colon and 60% of the dry mass of feces . This fact makes feces an ideal source to test for gut flora for any tests and experiments by extracting the nucleic acid from fecal specimens, and bacterial 16S rRNA gene sequences are generated with bacterial primers . This form of testing is also often preferable to more invasive techniques, such as biopsies . Somewhere between 300 and 1000 different species live in the gut, with most estimates at about 500 . However, it is probable that 99% of the bacteria come from about 30 or 40 species, with Faecalibacterium prausnitzii being the most common species in healthy adults . Fungi and protists also make up a part of the gut flora, but less is known about their activities . The virome is mostly bacteriophages . </P>

What is the flora of the large intestine
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