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Effect of host factors on the composition of the intestinal microflora
| Site | Host factor | Effect on Intestinal flora |
|---|---|---|
| Proximal small bowel | Achlorhydria | ↑ Escherichia coli, Bacteroides fragilis |
| Vagotomy and pyloroplasty | ↑ B fragilis, Bifidobacterium | |
| Mid and distal small bowel | Regional enteritis, blind loop, diverticulitis, irradiation, obstruction | ‘Colonic flora’ |
| Colon | Colonic resection with ileostomy | ↓ Anaerobes and some aerobes |
