Table 1.

Summary of findings from systematic review of the literature addressing microbiota at the level of phylum, order, family, genus, and species and appraising microbial diversity in IBS

Variable	Bacteria in Patients with IBS
2 papers with increase in IBS	Aeromonas, Aneurinibacillus, Bacillus, Campylobacter, Clostridium difficile, Enterobacteriales, Helicobacter, Lactobacillus salivarius, Pediococcus, Pseudomonas aeruginosa, Ruminococcus gnavus
3 papers with decrease in IBS	Uncultured Clostridiales I
3 or more papers with no difference	Clostridium coccoides (4 papers)

Summary of findings from systematic review of the literature (55). IBS, irritable bowel syndrome.