facultatively anaerobic groups ( streptococcus , staphylococcus , lactobacillus , and escherichia coli ) comprised the predominant flora of the duodenum and ileum , although large numbers of anaerobes ( 9 to 39 % of the small intestine isolates ) , represented by species of eubacterium , propionibacterium , clostridium , gemmiger , and fusobacterium , were also recovered .
C0013303
duodenum
C0021852
small intestine